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-rw-r--r--intl/icu/source/common/umutex.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/intl/icu/source/common/umutex.h b/intl/icu/source/common/umutex.h
index b52010f8a..e26ac3555 100644
--- a/intl/icu/source/common/umutex.h
+++ b/intl/icu/source/common/umutex.h
@@ -86,7 +86,9 @@ U_NAMESPACE_END
// Original plan was to use gcc atomics for MinGW, but they
// aren't supported, so we fold MinGW into this path.
+# ifndef WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
+# endif
# define VC_EXTRALEAN
# define NOUSER
# define NOSERVICE