diff --git a/src/plugin.h b/src/plugin.h
index 87ec113f..b0a591b4 100644
--- a/src/plugin.h
+++ b/src/plugin.h
@@ -50,7 +50,7 @@ typedef void _DL_AnyProc(proplist_t);
 #define W_STRING_MTEXT  4
 #define W_STRING_MEMBERS 5
 
-typedef void _DL_DrawStringProc(proplist_t, Drawable, GC, WMFont *, int, int, unsigned, unsigned, char *, int);
+typedef void _DL_DrawStringProc(proplist_t, Drawable, int, int, unsigned, unsigned, char*, void**);
 #endif
 
 typedef void _DL_FreeDataProc(proplist_t pl, void *free_data);