diff --git a/lib/test.gi b/lib/test.gi
index 84ce8c2aa9..c59b7c864e 100644
--- a/lib/test.gi
+++ b/lib/test.gi
@@ -63,6 +63,7 @@ InstallGlobalFunction(ParseTestInput, function(str, ignorecomments)
       Add(outp[Length(outp)], '\n');
       i := i+1;
     else
+      Error("Invalid data in test file");
       i := i+1;
     fi;
   od;