diff --git a/src/os_win32.c b/src/os_win32.c
index 0470450..e93e6d0 100644
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -1492,6 +1492,11 @@
 	{
 	    DWORD dwWaitTime = dwEndTime - dwNow;
 
+#ifdef FEAT_CHANNEL
+	    /* Check channel while waiting input. */
+	    if (dwWaitTime > 100)
+		dwWaitTime = 100;
+#endif
 #ifdef FEAT_MZSCHEME
 	    if (mzthreads_allowed() && p_mzq > 0
 				    && (msec < 0 || (long)dwWaitTime > p_mzq))