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-rw-r--r--src/math/isnormal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/math/isnormal.c b/src/math/isnormal.c
index 868c7ea2..95e82b1b 100644
--- a/src/math/isnormal.c
+++ b/src/math/isnormal.c
@@ -1,6 +1,6 @@
#include <math.h>
-#define isnormal(x) (fpclassify(x) == FP_NORMAL)
+#define isnormal(__x) (fpclassify(__x) == FP_NORMAL)
/*
STDC(199901)