diff --git a/src/gui_w32.c b/src/gui_w32.c
index 6a0e0a3..05d8e30 100644
--- a/src/gui_w32.c
+++ b/src/gui_w32.c
@@ -2292,7 +2292,7 @@
  * Get IM status.  When IM is on, return not 0.  Else return 0.
  */
     int
-im_get_status()
+im_get_status(void)
 {
     return global_ime_get_status();
 }