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-rw-r--r--include/jemalloc/jemalloc_macros.h.in2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/jemalloc/jemalloc_macros.h.in b/include/jemalloc/jemalloc_macros.h.in
index 129240ed..673ffd9b 100644
--- a/include/jemalloc/jemalloc_macros.h.in
+++ b/include/jemalloc/jemalloc_macros.h.in
@@ -37,7 +37,7 @@
# define JEMALLOC_CXX_THROW
#endif
-#if _MSC_VER
+#if defined(_MSC_VER)
# define JEMALLOC_ATTR(s)
# define JEMALLOC_ALIGNED(s) __declspec(align(s))
# define JEMALLOC_ALLOC_SIZE(s)