diff --git a/src/os_win32.c b/src/os_win32.c
index 0607bd2..5eacce6 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -6187,10 +6187,10 @@
 
 
 /*
- * check for an "interrupt signal": CTRL-break or CTRL-C
+ * Check for an "interrupt signal": CTRL-break or CTRL-C.
  */
     void
-mch_breakcheck(void)
+mch_breakcheck(int force)
 {
 #ifndef FEAT_GUI_W32	    /* never used */
     if (g_fCtrlCPressed || g_fCBrkPressed)