diff --git a/uisimulator/guiclient.h b/uisimulator/guiclient.h
deleted file mode 100644
index 472e7fa3be..0000000000
--- a/uisimulator/guiclient.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef GUICLIENT_H
-#define GUICLIENT_H
-
-extern void drawline(int color, int x1, int y1, int x2, int y2);
-
-#endif