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-rw-r--r--src/math/isnan.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/math/isnan.c b/src/math/isnan.c
index e3e0160a..80bbb741 100644
--- a/src/math/isnan.c
+++ b/src/math/isnan.c
@@ -1,5 +1,6 @@
#include <math.h>
-#define isnan(x) (fpclassify(x) == FP_NAN)
+
+#define isnan(__x) (fpclassify(__x) == FP_NAN)
/*
STDC(199901)