diff --git a/gb.pdf/src/main.h b/gb.pdf/src/main.h
index 2877c7d35..1d67d701e 100644
--- a/gb.pdf/src/main.h
+++ b/gb.pdf/src/main.h
@@ -24,6 +24,7 @@
 #ifndef __MAIN_H
 #define __MAIN_H
 
+#include "config.h"
 #include "gambas.h"
 #include "gb.image.h"