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-rw-r--r--Build/source/utils/asymptote/main.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/Build/source/utils/asymptote/main.cc b/Build/source/utils/asymptote/main.cc
index 7350ab3da42..946dd4d9094 100644
--- a/Build/source/utils/asymptote/main.cc
+++ b/Build/source/utils/asymptote/main.cc
@@ -19,7 +19,9 @@
*
*************/
+#ifdef __CYGWIN__
#define _POSIX_C_SOURCE 200809L
+#endif
#include <iostream>
#include <cstdlib>