diff --git a/src/top.c b/src/top.c
index 2824261c..40b80479 100644
--- a/src/top.c
+++ b/src/top.c
@@ -21,6 +21,7 @@
 
 #ifdef HAVE_CURSES
 
+#undef KEY_EVENT  /* There are conflicting declarations for KEY_EVENT in Windows wincon.h and curses.h. */
 #include <curses.h>
 
 #include "control_common.h"