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-rw-r--r--cpp/src/Ice/Network.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/cpp/src/Ice/Network.cpp b/cpp/src/Ice/Network.cpp
index 50cdc460182..34c7ec09b2c 100644
--- a/cpp/src/Ice/Network.cpp
+++ b/cpp/src/Ice/Network.cpp
@@ -23,6 +23,9 @@
//
#if defined(__MINGW32__)
# define _WIN32_WINNT 0x0501
+# ifndef IPV6_V6ONLY
+# define IPV6_V6ONLY 27
+# endif
#endif
#include <IceUtil/DisableWarnings.h>