diff --git a/Cargo.toml b/Cargo.toml
index b1faa4e8e6a..4698285386f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -41,6 +41,9 @@ xxx_debug_only_print_generated_code = [
   "wasm-bindgen-macro/xxx_debug_only_print_generated_code",
 ]
 
+## Turns off coverage generation for describe blocks
+unstable-coverage = ["wasm-bindgen-macro/unstable-coverage"]
+
 [dependencies]
 wasm-bindgen-macro = { path = "crates/macro", version = "=0.2.90" }
 serde = { version = "1.0", optional = true }
diff --git a/crates/backend/Cargo.toml b/crates/backend/Cargo.toml
index 8be4e953a1f..19f12fdb5af 100644
--- a/crates/backend/Cargo.toml
+++ b/crates/backend/Cargo.toml
@@ -15,6 +15,7 @@ rust-version = "1.57"
 [features]
 spans = []
 extra-traits = ["syn/extra-traits"]
+unstable-coverage = []
 
 [dependencies]
 bumpalo = "3.0.0"
diff --git a/crates/backend/src/codegen.rs b/crates/backend/src/codegen.rs
index bbcbc9cea14..ac3f535c3d9 100644
--- a/crates/backend/src/codegen.rs
+++ b/crates/backend/src/codegen.rs
@@ -160,6 +160,16 @@ impl TryToTokens for ast::LinkToModule {
     }
 }
 
+#[cfg(feature = "unstable-coverage")]
+fn coverage() -> TokenStream {
+    quote!(#[coverage(off)])
+}
+
+#[cfg(not(feature = "unstable-coverage"))]
+fn coverage() -> TokenStream {
+    quote!()
+}
+
 impl ToTokens for ast::Struct {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         let name = &self.rust_name;
@@ -169,10 +179,12 @@ impl ToTokens for ast::Struct {
         let new_fn = Ident::new(&shared::new_function(&name_str), Span::call_site());
         let free_fn = Ident::new(&shared::free_function(&name_str), Span::call_site());
         let unwrap_fn = Ident::new(&shared::unwrap_function(&name_str), Span::call_site());
+        let coverage = coverage();
         let wasm_bindgen = &self.wasm_bindgen;
         (quote! {
             #[automatically_derived]
             impl #wasm_bindgen::describe::WasmDescribe for #name {
+                #coverage
                 fn describe() {
                     use #wasm_bindgen::__wbindgen_if_not_std;
                     __wbindgen_if_not_std! {
@@ -814,6 +826,7 @@ impl ToTokens for ast::ImportType {
         });
 
         let no_deref = self.no_deref;
+        let coverage = coverage();
 
         (quote! {
             #[automatically_derived]
@@ -835,6 +848,7 @@ impl ToTokens for ast::ImportType {
                 use #wasm_bindgen::__rt::core;
 
                 impl WasmDescribe for #rust_name {
+                    #coverage
                     fn describe() {
                         #description
                     }
@@ -1048,6 +1062,7 @@ impl ToTokens for ast::ImportEnum {
         let variant_paths_ref = &variant_paths;
 
         let wasm_bindgen = &self.wasm_bindgen;
+        let coverage = coverage();
 
         (quote! {
             #(#attrs)*
@@ -1082,6 +1097,7 @@ impl ToTokens for ast::ImportEnum {
             // It should really be using &str for all of these, but that requires some major changes to cli-support
             #[automatically_derived]
             impl #wasm_bindgen::describe::WasmDescribe for #name {
+                #coverage
                 fn describe() {
                     <#wasm_bindgen::JsValue as #wasm_bindgen::describe::WasmDescribe>::describe()
                 }
@@ -1404,6 +1420,7 @@ impl ToTokens for ast::Enum {
         });
         let try_from_cast_clauses = cast_clauses.clone();
         let wasm_bindgen = &self.wasm_bindgen;
+        let coverage = coverage();
         (quote! {
             #[automatically_derived]
             impl #wasm_bindgen::convert::IntoWasmAbi for #enum_name {
@@ -1441,6 +1458,7 @@ impl ToTokens for ast::Enum {
 
             #[automatically_derived]
             impl #wasm_bindgen::describe::WasmDescribe for #enum_name {
+                #coverage
                 fn describe() {
                     use #wasm_bindgen::describe::*;
                     inform(ENUM);
diff --git a/crates/backend/src/lib.rs b/crates/backend/src/lib.rs
index d9262e857f5..92311fae31c 100644
--- a/crates/backend/src/lib.rs
+++ b/crates/backend/src/lib.rs
@@ -27,6 +27,11 @@
 #![cfg_attr(feature = "extra-traits", deny(missing_debug_implementations))]
 #![deny(missing_docs)]
 #![doc(html_root_url = "https://docs.rs/wasm-bindgen-backend/0.2")]
+#![cfg_attr(
+    feature = "unstable-coverage",
+    feature(allow_internal_unstable),
+    allow(internal_features)
+)]
 
 pub use crate::codegen::TryToTokens;
 pub use crate::error::Diagnostic;
diff --git a/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs b/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs
index dc605cac47e..95df5bd77eb 100644
--- a/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs
+++ b/crates/cli/src/bin/wasm-bindgen-test-runner/main.rs
@@ -264,7 +264,6 @@ fn coverage_args(tmpdir: &Path) -> Option<PathBuf> {
         .map(|s| s.to_str().unwrap().to_string())
         .unwrap_or_default();
 
-
     match env::var_os("WASM_BINDGEN_UNSTABLE_TEST_PROFRAW_OUT") {
         Some(s) => {
             let mut buf = PathBuf::from(s);
diff --git a/crates/macro-support/Cargo.toml b/crates/macro-support/Cargo.toml
index 1ba1c8717b8..c57525b0bb6 100644
--- a/crates/macro-support/Cargo.toml
+++ b/crates/macro-support/Cargo.toml
@@ -16,6 +16,7 @@ rust-version = "1.57"
 spans = ["wasm-bindgen-backend/spans"]
 extra-traits = ["syn/extra-traits"]
 strict-macro = []
+unstable-coverage = ["wasm-bindgen-backend/unstable-coverage"]
 
 [dependencies]
 syn = { version = '2.0', features = ['visit', 'full'] }
diff --git a/crates/macro/Cargo.toml b/crates/macro/Cargo.toml
index ae7a3044ced..a122574a641 100644
--- a/crates/macro/Cargo.toml
+++ b/crates/macro/Cargo.toml
@@ -19,6 +19,7 @@ proc-macro = true
 spans = ["wasm-bindgen-macro-support/spans"]
 xxx_debug_only_print_generated_code = []
 strict-macro = ["wasm-bindgen-macro-support/strict-macro"]
+unstable-coverage = ["wasm-bindgen-macro-support/unstable-coverage"]
 
 [dependencies]
 wasm-bindgen-macro-support = { path = "../macro-support", version = "=0.2.90" }
diff --git a/crates/macro/src/lib.rs b/crates/macro/src/lib.rs
index fbae818750e..15f313a4f18 100644
--- a/crates/macro/src/lib.rs
+++ b/crates/macro/src/lib.rs
@@ -1,4 +1,9 @@
 #![doc(html_root_url = "https://docs.rs/wasm-bindgen-macro/0.2")]
+#![cfg_attr(
+    feature = "unstable-coverage",
+    feature(allow_internal_unstable),
+    allow(internal_features)
+)]
 
 extern crate proc_macro;
 
@@ -6,6 +11,10 @@ use proc_macro::TokenStream;
 use quote::quote;
 
 #[proc_macro_attribute]
+#[cfg_attr(
+    feature = "unstable-coverage",
+    allow_internal_unstable(coverage_attribute)
+)]
 pub fn wasm_bindgen(attr: TokenStream, input: TokenStream) -> TokenStream {
     match wasm_bindgen_macro_support::expand(attr.into(), input.into()) {
         Ok(tokens) => {
diff --git a/crates/test/Cargo.toml b/crates/test/Cargo.toml
index 8384d50b395..c77a8435623 100644
--- a/crates/test/Cargo.toml
+++ b/crates/test/Cargo.toml
@@ -10,7 +10,7 @@ rust-version = "1.57"
 
 [features]
 default = []
-unstable-coverage = ["minicov"]
+unstable-coverage = ["minicov", "wasm-bindgen/unstable-coverage"]
 
 [dependencies]
 console_error_panic_hook = '0.1'
diff --git a/src/closure.rs b/src/closure.rs
index 319f4c63c24..78933e399e2 100644
--- a/src/closure.rs
+++ b/src/closure.rs
@@ -465,6 +465,7 @@ impl<T> WasmDescribe for Closure<T>
 where
     T: WasmClosure + ?Sized,
 {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(EXTERNREF);
     }
@@ -565,6 +566,7 @@ macro_rules! doit {
             where $($var: FromWasmAbi + 'static,)*
                   R: ReturnWasmAbi + 'static,
         {
+            #[cfg_attr(feature = "unstable-coverage", coverage(off))]
             fn describe() {
                 #[allow(non_snake_case)]
                 unsafe extern "C" fn invoke<$($var: FromWasmAbi,)* R: ReturnWasmAbi>(
@@ -622,6 +624,7 @@ macro_rules! doit {
             where $($var: FromWasmAbi + 'static,)*
                   R: ReturnWasmAbi + 'static,
         {
+            #[cfg_attr(feature = "unstable-coverage", coverage(off))]
             fn describe() {
                 #[allow(non_snake_case)]
                 unsafe extern "C" fn invoke<$($var: FromWasmAbi,)* R: ReturnWasmAbi>(
@@ -763,6 +766,7 @@ where
     A: RefFromWasmAbi,
     R: ReturnWasmAbi + 'static,
 {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         #[allow(non_snake_case)]
         unsafe extern "C" fn invoke<A: RefFromWasmAbi, R: ReturnWasmAbi>(
@@ -809,6 +813,7 @@ where
     A: RefFromWasmAbi,
     R: ReturnWasmAbi + 'static,
 {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         #[allow(non_snake_case)]
         unsafe extern "C" fn invoke<A: RefFromWasmAbi, R: ReturnWasmAbi>(
diff --git a/src/convert/closures.rs b/src/convert/closures.rs
index 8227a6b622f..b0a2ef8ffe4 100644
--- a/src/convert/closures.rs
+++ b/src/convert/closures.rs
@@ -54,6 +54,7 @@ macro_rules! stack_closures {
             where $($var: FromWasmAbi,)*
                   R: ReturnWasmAbi
         {
+            #[cfg_attr(feature = "unstable-coverage", coverage(off))]
             fn describe() {
                 inform(FUNCTION);
                 inform($invoke::<$($var,)* R> as u32);
@@ -108,6 +109,7 @@ macro_rules! stack_closures {
             where $($var: FromWasmAbi,)*
                   R: ReturnWasmAbi
         {
+            #[cfg_attr(feature = "unstable-coverage", coverage(off))]
             fn describe() {
                 inform(FUNCTION);
                 inform($invoke_mut::<$($var,)* R> as u32);
@@ -177,6 +179,7 @@ where
     A: RefFromWasmAbi,
     R: ReturnWasmAbi,
 {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(FUNCTION);
         inform(invoke1_ref::<A, R> as u32);
@@ -232,6 +235,7 @@ where
     A: RefFromWasmAbi,
     R: ReturnWasmAbi,
 {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(FUNCTION);
         inform(invoke1_mut_ref::<A, R> as u32);
diff --git a/src/describe.rs b/src/describe.rs
index d3b5fd0b546..c0dfd64a60e 100644
--- a/src/describe.rs
+++ b/src/describe.rs
@@ -103,18 +103,21 @@ cfg_if! {
 }
 
 impl<T> WasmDescribe for *const T {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(U32)
     }
 }
 
 impl<T> WasmDescribe for *mut T {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(U32)
     }
 }
 
 impl<T: WasmDescribe> WasmDescribe for [T] {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(SLICE);
         T::describe();
@@ -122,6 +125,7 @@ impl<T: WasmDescribe> WasmDescribe for [T] {
 }
 
 impl<'a, T: WasmDescribe + ?Sized> WasmDescribe for &'a T {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(REF);
         T::describe();
@@ -129,6 +133,7 @@ impl<'a, T: WasmDescribe + ?Sized> WasmDescribe for &'a T {
 }
 
 impl<'a, T: WasmDescribe + ?Sized> WasmDescribe for &'a mut T {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(REFMUT);
         T::describe();
@@ -166,12 +171,14 @@ if_std! {
     }
 
     impl<T: WasmDescribeVector> WasmDescribe for Box<[T]> {
+        #[cfg_attr(feature = "unstable-coverage", coverage(off))]
         fn describe() {
             T::describe_vector();
         }
     }
 
     impl<T> WasmDescribe for Vec<T> where Box<[T]>: WasmDescribe {
+        #[cfg_attr(feature = "unstable-coverage", coverage(off))]
         fn describe() {
             <Box<[T]>>::describe();
         }
@@ -179,6 +186,7 @@ if_std! {
 }
 
 impl<T: WasmDescribe> WasmDescribe for Option<T> {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(OPTIONAL);
         T::describe();
@@ -186,12 +194,14 @@ impl<T: WasmDescribe> WasmDescribe for Option<T> {
 }
 
 impl WasmDescribe for () {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(UNIT)
     }
 }
 
 impl<T: WasmDescribe, E: Into<JsValue>> WasmDescribe for Result<T, E> {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(RESULT);
         T::describe();
@@ -199,6 +209,7 @@ impl<T: WasmDescribe, E: Into<JsValue>> WasmDescribe for Result<T, E> {
 }
 
 impl<T: WasmDescribe> WasmDescribe for Clamped<T> {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         inform(CLAMPED);
         T::describe();
@@ -206,6 +217,7 @@ impl<T: WasmDescribe> WasmDescribe for Clamped<T> {
 }
 
 impl WasmDescribe for JsError {
+    #[cfg_attr(feature = "unstable-coverage", coverage(off))]
     fn describe() {
         JsValue::describe();
     }
diff --git a/src/lib.rs b/src/lib.rs
index f38d6a3e2c4..9b5783f6d6d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,6 +8,7 @@
 #![no_std]
 #![allow(coherence_leak_check)]
 #![doc(html_root_url = "https://docs.rs/wasm-bindgen/0.2")]
+#![cfg_attr(feature = "unstable-coverage", feature(coverage_attribute))]
 
 use core::convert::TryFrom;
 use core::fmt;