diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 173132d502f5..effcc195d7e9 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <stdbool.h>
+#include <unistd.h>
 #include <linux/types.h>
 
 enum perf_data_mode {