diff --git a/cssutils/tests/basetest.py b/cssutils/tests/basetest.py
index ff628cbd..a51efa1e 100644
--- a/cssutils/tests/basetest.py
+++ b/cssutils/tests/basetest.py
@@ -126,7 +126,7 @@ def assertRaisesMsg(self, excClass, msg, callableObj, *args, **kwargs):
             if not msg:
                 # No message provided: any message is fine.
                 return
-            elif excMsg == msg:
+            elif msg in excMsg:
                 # Message provided, and we got the right message: passes.
                 return
             else: