diff --git a/src/support/os.cpp b/src/support/os.cpp
index a18637c772..f36331cccc 100644
--- a/src/support/os.cpp
+++ b/src/support/os.cpp
@@ -11,6 +11,7 @@
 
 #include <config.h>
 
+#include "debug.h"
 #include "filetools.h"
 #include "qstring_helpers.h"