diff --git a/libavutil/x86/cpu.c b/libavutil/x86/cpu.c
index 4df3286f39..4b6cb0df00 100644
--- a/libavutil/x86/cpu.c
+++ b/libavutil/x86/cpu.c
@@ -21,6 +21,7 @@
  */
 
 #include <stdlib.h>
+#include <string.h>
 #include "libavutil/x86_cpu.h"
 #include "libavutil/cpu.h"