diff --git a/com.avaloq.tools.ddk.typesystem.test/src/com/avaloq/tools/ddk/typesystem/ParameterListMatcherTest.java b/com.avaloq.tools.ddk.typesystem.test/src/com/avaloq/tools/ddk/typesystem/ParameterListMatcherTest.java
index 48395fd31..94f0e07fc 100644
--- a/com.avaloq.tools.ddk.typesystem.test/src/com/avaloq/tools/ddk/typesystem/ParameterListMatcherTest.java
+++ b/com.avaloq.tools.ddk.typesystem.test/src/com/avaloq/tools/ddk/typesystem/ParameterListMatcherTest.java
@@ -13,7 +13,6 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertSame;
-import static org.junit.Assert.fail;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -179,13 +178,9 @@ public IMatchResult checkMatch(final IActualParameter actual, final IFormalParam
         } else {
           return matchResultTypeError;
         }
-      } else {
-        fail("incorrect parameters");
-        return null;
-      }
-
+      } 
+      throw new AssertionError("incorrect parameters");
     }
-
   }
 
   private final ParameterListMatcher parameterListMatcher = new ParameterListMatcher();