diff --git a/src/glx/x11/glxhash.c b/src/glx/x11/glxhash.c
index 7d28ada49ca..6f2c51d39dd 100644
--- a/src/glx/x11/glxhash.c
+++ b/src/glx/x11/glxhash.c
@@ -77,6 +77,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #define HASH_MAGIC 0xdeadbeef
 #define HASH_DEBUG 0