diff --git a/src/os_mswin.c b/src/os_mswin.c
index 696847e..dd42012 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -809,6 +809,18 @@
     /* never used */
     return TRUE;
 }
+
+# if defined(FEAT_TERMINAL) || defined(PROTO)
+/*
+ * Check for any pending input or messages.
+ */
+    int
+mch_check_messages(void)
+{
+    /* TODO: check for messages */
+    return TRUE;
+}
+# endif
 #endif