diff --git a/src/keyboard.c b/src/keyboard.c
index 07392b7d495..714c8fee656 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -1932,7 +1932,7 @@ start_polling (void)
 #endif
 }
 
-#ifdef DOS_NT
+#if defined CYGWIN || defined DOS_NT
 /* True if we are using polling to handle input asynchronously.  */
 
 bool