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-rw-r--r--src/util/cpp11.h2
-rw-r--r--src/util/cpp11_container.h2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/util/cpp11.h b/src/util/cpp11.h
index 14913cb86..17903f2e3 100644
--- a/src/util/cpp11.h
+++ b/src/util/cpp11.h
@@ -20,7 +20,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#ifndef MT_CPP11_HEADER
#define MT_CPP11_HEADER
-#if __cplusplus < 201103L || _MSC_VER < 1600
+#if __cplusplus < 201103L || (defined(_MSC_VER) && _MSC_VER < 1600)
#define USE_CPP11_FAKE_KEYWORD
#endif
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