diff --git a/tests/contractabi/testCustomTypes.nim b/tests/contractabi/testCustomTypes.nim
index 9e61b54..415a2a9 100644
--- a/tests/contractabi/testCustomTypes.nim
+++ b/tests/contractabi/testCustomTypes.nim
@@ -73,8 +73,8 @@ suite "custom types":
     check AbiDecoder.decode(encoding, Custom2) == success custom2
 
   test "fail when finishTuple() is missing":
-    expect AssertionDefect:
+    expect Exception:
       discard AbiEncoder.encode(custom3)
     let encoding = AbiEncoder.encode( (custom3.a, custom3.b) )
-    expect AssertionDefect:
+    expect Exception:
       discard AbiDecoder.decode(encoding, Custom3)