diff --git a/src/ui/privwin.c b/src/ui/privwin.c
index af7ad0de..ac83cfe9 100644
--- a/src/ui/privwin.c
+++ b/src/ui/privwin.c
@@ -40,6 +40,7 @@
 #include "ui/titlebar.h"
 #include "window_list.h"
 #include "config/preferences.h"
+#include "stdlib.h"
 
 void
 privwin_incoming_msg(ProfPrivateWin *privatewin, const char *const message, GDateTime *timestamp)