diff --git a/src/osd/windows/output.h b/src/osd/windows/output.h
index 84499056fb7..177d0a93c9f 100644
--- a/src/osd/windows/output.h
+++ b/src/osd/windows/output.h
@@ -117,6 +117,7 @@ struct _copydata_id_string
 	char		string[1];			// string array containing the data
 };
 
+void winoutput_init(running_machine &machine);
 
 
 #endif /* __WINDOWS_OUTPUT_H__ */