diff --git a/src/lib.rs b/src/lib.rs
index 92982f13..c02eefd9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -152,25 +152,12 @@ pub use self::{
 
 #[cfg(test)]
 use {
+  std::assert_matches,
   strum::IntoDiscriminant,
   tempfile::TempDir,
   test::{assert_cbor, assert_encoding, tempdir},
 };
 
-#[macro_export]
-macro_rules! assert_matches {
-  ($expression:expr, $( $pattern:pat_param )|+ $( if $guard:expr )? $(,)?) => {
-    match $expression {
-      $( $pattern )|+ $( if $guard )? => {}
-      left => panic!(
-        "assertion failed: (left ~= right)\n  left: `{:?}`\n right: `{}`",
-        left,
-        stringify!($($pattern)|+ $(if $guard)?)
-      ),
-    }
-  }
-}
-
 #[cfg(test)]
 macro_rules! assert_matches_regex {
   ($haystack:expr, $re:expr $(,)?) => {{
diff --git a/tests/lib.rs b/tests/lib.rs
index a500c087..b576ccda 100644
--- a/tests/lib.rs
+++ b/tests/lib.rs
@@ -3,12 +3,13 @@ use {
   camino::{Utf8Path, Utf8PathBuf},
   filepack::{
     Decode, Decoder, Directory, Encoder, Fingerprint, Hash, Manifest, Metadata, PrivateKey,
-    PublicKey, assert_matches,
+    PublicKey,
     templates::{DirectoryHtml, PackageHtml, Page, PageHtml},
   },
   regex::Regex,
   reqwest::StatusCode,
   std::{
+    assert_matches,
     collections::{BTreeMap, BTreeSet},
     fs,
     io::{Read, Write},