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-rw-r--r--math/s_nan.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/math/s_nan.c b/math/s_nan.c
index d9af7752ce..03e95f56ad 100644
--- a/math/s_nan.c
+++ b/math/s_nan.c
@@ -24,7 +24,6 @@
 #include <ieee754.h>
 
 
-#undef __nan
 double
 __nan (const char *tagp)
 {