diff --git a/src/libdraw/devdraw.c b/src/libdraw/devdraw.c
index a3c4e5a0..3f7d5063 100644
--- a/src/libdraw/devdraw.c
+++ b/src/libdraw/devdraw.c
@@ -10,6 +10,8 @@
 #include <memdraw.h>
 #include <memlayer.h>
 
+extern void _flushmemscreen(Rectangle);
+
 #define NHASH (1<<5)
 #define HASHMASK (NHASH-1)