diff --git a/src/ui/mucwin.c b/src/ui/mucwin.c
index fb224598..58fef4d1 100644
--- a/src/ui/mucwin.c
+++ b/src/ui/mucwin.c
@@ -32,6 +32,7 @@
  *
  */
 
+#include <string.h>
 #include <assert.h>
 
 #include "ui/win_types.h"