diff --git a/tools/perf/util/pmu.y b/tools/perf/util/pmu.y
index bfd7e8509869..0dab0ec2eff7 100644
--- a/tools/perf/util/pmu.y
+++ b/tools/perf/util/pmu.y
@@ -10,8 +10,6 @@
 #include <string.h>
 #include "pmu.h"
 
-extern int perf_pmu_lex (void);
-
 #define ABORT_ON(val) \
 do { \
         if (val) \