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-rw-r--r--src/util/cpp11_container.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/util/cpp11_container.h b/src/util/cpp11_container.h
index 0194385fc..a09154071 100644
--- a/src/util/cpp11_container.h
+++ b/src/util/cpp11_container.h
@@ -24,7 +24,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#define USE_UNORDERED_CONTAINERS
#endif
-#if _MSC_VER >= 1600
+#if defined(_MSC_VER) && _MSC_VER >= 1600
#define USE_UNORDERED_CONTAINERS
#endif