diff --git a/src/sciwrappers.h b/src/sciwrappers.h
index 1e8f4cf6..8cad36d8 100644
--- a/src/sciwrappers.h
+++ b/src/sciwrappers.h
@@ -24,6 +24,9 @@
 #define GEANY_SCIWRAPPERS_H 1
 
 #include "Scintilla.h"
+#ifndef PLAT_GTK
+#   define PLAT_GTK 1
+#endif
 #include "ScintillaWidget.h"