1 files changed, 4 insertions, 0 deletions
diff --git a/tests/auto/blackbox/testdata/dynamicRuleOutputs/after/numbers.l b/tests/auto/blackbox/testdata/dynamicRuleOutputs/after/numbers.l
index b29f8798f..5c06e1258 100644
--- a/tests/auto/blackbox/testdata/dynamicRuleOutputs/after/numbers.l
+++ b/tests/auto/blackbox/testdata/dynamicRuleOutputs/after/numbers.l
@@ -40,6 +40,10 @@
 %option noyywrap
 
 %{
+#ifndef CRUCIAL_DEFINE
+#   error CRUCIAL_DEFINE is missing!
+#endif
+
 /* need this for the call to atof() below */
 #include <math.h>
 %}