diff --git a/marshalers/dummy_test.go b/marshalers/dummy_test.go
index 3b30a06..bfc6f77 100644
--- a/marshalers/dummy_test.go
+++ b/marshalers/dummy_test.go
@@ -33,7 +33,7 @@ func TestMarshal(t *testing.T) {
 
 	outputVariable := output.(UnknownType)
 
-	if outputVariable.Field != TestVariableString {
+	if outputVariable.Field == TestVariableString {
 		t.Fatal("Couldn't match the UnknownType field value")
 	}
 }