diff --git a/microtest.py b/microtest.py
index a2538ce..1a77c3f 100644
--- a/microtest.py
+++ b/microtest.py
@@ -50,8 +50,8 @@ async def to_throw(self, exception = Exception):
 
     try:
       await self.value()
-    except exception:
-      threw_expected = True
+    except Exception as caught_exception:
+      threw_expected = exception.__name__ == type(caught_exception).__name__
       pass
 
     if self._fails(not threw_expected):