diff --git a/crypto/ecdsa/ecdsa_test.c b/crypto/ecdsa/ecdsa_test.c
index 16b474de..12d02d6d 100644
--- a/crypto/ecdsa/ecdsa_test.c
+++ b/crypto/ecdsa/ecdsa_test.c
@@ -313,6 +313,8 @@ static int test_builtin(FILE *out) {
     }
     fprintf(out, ".");
     fflush(out);
+    ECDSA_SIG_free(ecdsa_sig);
+    ecdsa_sig = NULL;
     OPENSSL_free(signature);
     signature = NULL;