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-rw-r--r--tools/perf/util/expr.y2
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/expr.y b/tools/perf/util/expr.y
index 6c93b358cc..e364790bab 100644
--- a/tools/perf/util/expr.y
+++ b/tools/perf/util/expr.y
@@ -1,6 +1,8 @@
/* Simple expression parser */
%{
+#ifndef NDEBUG
#define YYDEBUG 1
+#endif
#include <assert.h>
#include <math.h>
#include <stdlib.h>