diff --git a/ci/run.sh b/ci/run.sh
index 875a206e84..2cde13c105 100755
--- a/ci/run.sh
+++ b/ci/run.sh
@@ -39,10 +39,6 @@ case ${TARGET} in
     *android*)
         export STDSIMD_DISABLE_ASSERT_INSTR=1
         ;;
-    wasm32*)
-        # export RUSTFLAGS="${RUSTFLAGS} -C target-feature=+simd128"
-        ;;
-
     *)
         ;;
 esac
@@ -63,13 +59,17 @@ cargo_test() {
 cargo_test
 cargo_test "--release"
 
-# Test x86 targets compiled with AVX.
+# Test targets compiled with extra features.
 case ${TARGET} in
     x86*)
         RUSTFLAGS="${RUSTFLAGS} -C target-feature=+avx"
         export STDSIMD_DISABLE_ASSERT_INSTR=1
         cargo_test "--release"
         ;;
+    wasm32-unknown-unknown*)
+        # export RUSTFLAGS="${RUSTFLAGS} -C target-feature=+simd128"
+        cargo_test "--release --features=wasm32_simd128"
+        ;;
     *)
         ;;
 esac
diff --git a/coresimd/wasm32/mod.rs b/coresimd/wasm32/mod.rs
index 054e187f9d..ea5a8e0ba0 100644
--- a/coresimd/wasm32/mod.rs
+++ b/coresimd/wasm32/mod.rs
@@ -1,11 +1,12 @@
 //! WASM32 intrinsics
 
 #[macro_use]
-#[cfg(not(test))]
+#[cfg(all(not(test), feature = "wasm_simd128"))]
 mod simd128;
-#[cfg(test)]
+
+#[cfg(all(test, feature = "wasm_simd128"))]
 pub mod simd128;
-pub use self::simd128::*;
+#[cfg(all(test, feature = "wasm_simd128"))]
 
 #[cfg(test)]
 use stdsimd_test::assert_instr;
diff --git a/crates/coresimd/Cargo.toml b/crates/coresimd/Cargo.toml
index f564ad1388..dac4d916da 100644
--- a/crates/coresimd/Cargo.toml
+++ b/crates/coresimd/Cargo.toml
@@ -31,3 +31,5 @@ strict = []
 # Internal-usage only: enables only those intrinsics supported by Intel's
 # Software Development Environment (SDE).
 intel_sde = []
+# Enables wasm simd128 intrinsics
+wasm_simd128 = []
diff --git a/crates/stdsimd/Cargo.toml b/crates/stdsimd/Cargo.toml
index 4ab553db48..3db3ed1187 100644
--- a/crates/stdsimd/Cargo.toml
+++ b/crates/stdsimd/Cargo.toml
@@ -37,3 +37,7 @@ path = "../../examples/hex.rs"
 name = "wasm"
 crate-type = ["cdylib"]
 path = "../../examples/wasm.rs"
+
+[features]
+default = []
+wasm_simd128 = ["coresimd/wasm_simd128"]
\ No newline at end of file