diff --git a/Python/strtod.c b/Python/strtod.c
index 7911a94..5c084a4 100644
--- a/Python/strtod.c
+++ b/Python/strtod.c
@@ -54,7 +54,7 @@
 
 extern	double	atof(const char *);		/* Only called when result known to be ok */
 
-#ifndef DONT_HAVE_ERRNO_H
+#ifdef HAVE_ERRNO_H
 #include <errno.h>
 #endif
 extern	int	errno;