diff --git a/src/ui/mucconfwin.c b/src/ui/mucconfwin.c
index c262ae0e..1e54f077 100644
--- a/src/ui/mucconfwin.c
+++ b/src/ui/mucconfwin.c
@@ -33,6 +33,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 
 #include "ui/ui.h"
 #include "ui/window.h"
diff --git a/src/ui/xmlwin.c b/src/ui/xmlwin.c
index b19586bb..7051b57b 100644
--- a/src/ui/xmlwin.c
+++ b/src/ui/xmlwin.c
@@ -33,6 +33,7 @@
  */
 
 #include <assert.h>
+#include <string.h>
 
 #include "ui/win_types.h"
 #include "window_list.h"