diff --git a/tests/demo/parse.rules b/tests/demo/parse.rules
index 4364054170..0cfa1d732e 100644
--- a/tests/demo/parse.rules
+++ b/tests/demo/parse.rules
@@ -1,2 +1,3 @@
 OK     /Wanted exception/ intentionally generated exception
-FAILED /Failure message/ artificial failure
\ No newline at end of file
+FAILED /Failure message/ artificial failure
+IGNORE /^Error [23]d = [\d.-]+/ debug output of blend command