diff --git a/t/rsa.t b/t/rsa.t
index 94a0d87..c13030b 100644
--- a/t/rsa.t
+++ b/t/rsa.t
@@ -54,7 +54,7 @@ sub _Test_Sign_And_Verify {
 sub _check_for_croak {
     my ( $code, $expected ) = @_;
     eval { &$code() };
-    ok( $@, "/$expected/" );
+    like( $@, qr/$expected/, "croak matches: $expected" );
 }
 
 # On platforms without a /dev/random, we need to manually seed.  In