diff --git a/cryptography/hazmat/backends/openssl/backend.py b/cryptography/hazmat/backends/openssl/backend.py
index bdbbffd..251dd09 100644
--- a/cryptography/hazmat/backends/openssl/backend.py
+++ b/cryptography/hazmat/backends/openssl/backend.py
@@ -796,7 +796,8 @@
         # occurs.
         assert res >= 0
         if res == 0:
-            assert self._backend._consume_errors()
+            errors = self._backend._consume_errors()
+            assert errors
             raise InvalidSignature
 
     def _verify_pkcs1(self, rsa_cdata, evp_pkey, evp_md):
@@ -813,7 +814,8 @@
         # occurs.
         assert res >= 0
         if res == 0:
-            assert self._backend._consume_errors()
+            errors = self._backend._consume_errors()
+            assert errors
             raise InvalidSignature