diff --git a/tools/perf/trace/beauty/flock.c b/tools/perf/trace/beauty/flock.c
index 021bb48c63361438f043685c1706834995e8398c..34b6348edb6eed1633d7c57ff7fdc6a0b9540b54 100644
--- a/tools/perf/trace/beauty/flock.c
+++ b/tools/perf/trace/beauty/flock.c
@@ -1,3 +1,4 @@
+#include <fcntl.h>
 
 static size_t syscall_arg__scnprintf_flock(char *bf, size_t size,
 					   struct syscall_arg *arg)