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-rw-r--r--src/mpfr-impl.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mpfr-impl.h b/src/mpfr-impl.h
index 8f443fd56..4dda07ac7 100644
--- a/src/mpfr-impl.h
+++ b/src/mpfr-impl.h
@@ -204,7 +204,7 @@ struct __gmpfr_cache_s {
typedef struct __gmpfr_cache_s mpfr_cache_t[1];
typedef struct __gmpfr_cache_s *mpfr_cache_ptr;
-#if defined(MPFR_USE_THREAD_SAFE) && defined(__GMP_LIBGMP_DLL)
+#if defined(MPFR_USE_THREAD_SAFE) && __GMP_LIBGMP_DLL
# define MPFR_WIN_THREAD_SAFE_DLL 1
#endif