1 files changed, 1 insertions, 1 deletions

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 52c777e451ed..f231f43424d2 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -18,7 +18,7 @@
 #include "util.h"
 #include "callchain.h"
 
-bool ip_callchain__valid(struct ip_callchain *chain, event_t *event)
+bool ip_callchain__valid(struct ip_callchain *chain, const event_t *event)
 {
         unsigned int chain_size = event->header.size;
         chain_size -= (unsigned long)&event->ip.__more_data - (unsigned long)event;