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-rw-r--r--win32/win32.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/win32/win32.h b/win32/win32.h
index 35d5bdfa98..3929bcc15c 100644
--- a/win32/win32.h
+++ b/win32/win32.h
@@ -200,6 +200,8 @@ typedef unsigned short mode_t;
/* Visual C thinks that a pointer to a member variable is 16 bytes in size. */
#define PERL_MEMBER_PTR_SIZE 16
+#define isnan _isnan
+
#endif /* _MSC_VER */
#ifdef __MINGW32__ /* Minimal Gnu-Win32 */