1 files changed, 1 insertions, 1 deletions

diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index f2e9ee164bd8..624a96c636fd 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -63,5 +63,5 @@ int register_callchain_param(struct callchain_param *param);
 int append_chain(struct callchain_node *root, struct ip_callchain *chain,
                  struct map_symbol *syms, u64 period);
 
-bool ip_callchain__valid(struct ip_callchain *chain, event_t *event);
+bool ip_callchain__valid(struct ip_callchain *chain, const event_t *event);
 #endif  /* __PERF_CALLCHAIN_H */