diff --git a/src/Airports/simple.cxx b/src/Airports/simple.cxx
index e862af61e..e24090b07 100644
--- a/src/Airports/simple.cxx
+++ b/src/Airports/simple.cxx
@@ -56,6 +56,10 @@
 SG_USING_STD(sort);
 SG_USING_STD(random_shuffle);
 
+#ifdef __CYGWIN__
+#define HUGE HUGE_VAL
+#endif
+
 /******************************************************************************
  * ScheduleTime
  ***************e*************************************************************/