diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index 8a7e8bb..0f4da09 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -4,6 +4,7 @@
 #include "../perf.h"
 #include <linux/list.h>
 #include <linux/rbtree.h>
+#include "event.h"
 #include "util.h"
 #include "symbol.h"
 
@@ -58,4 +59,6 @@
 int register_callchain_param(struct callchain_param *param);
 int append_chain(struct callchain_node *root, struct ip_callchain *chain,
 		 struct map_symbol *syms);
+
+bool ip_callchain__valid(struct ip_callchain *chain, event_t *event);
 #endif	/* __PERF_CALLCHAIN_H */