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-rw-r--r--win32/win32.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/win32/win32.h b/win32/win32.h
index 99507e44d8..92dd59c169 100644
--- a/win32/win32.h
+++ b/win32/win32.h
@@ -183,9 +183,6 @@ extern pid_t rb_w32_getpid(void);
#ifndef isnan
#define isnan(x) _isnan(x)
#endif
-#ifndef isinf
-#define isinf(x) (!_finite(x) && !_isnan(x))
-#endif
#ifndef finite
#define finite(x) _finite(x)
#endif