Index: aws-crt-python/crt/s2n/utils/s2n_fork_detection.c
===================================================================
--- aws-crt-python.orig/crt/s2n/utils/s2n_fork_detection.c
+++ aws-crt-python/crt/s2n/utils/s2n_fork_detection.c
@@ -46,8 +46,8 @@ typedef __darwin_pthread_once_t pthread_
 #include "utils/s2n_safety.h"
 
 #if defined(S2N_MADVISE_SUPPORTED) && defined(MADV_WIPEONFORK)
-    #if (MADV_WIPEONFORK != 18)
-        #error "MADV_WIPEONFORK is not 18"
+    #if !((MADV_WIPEONFORK == 18) || (MADV_WIPEONFORK == 71))
+        #error "MADV_WIPEONFORK has strange number"
     #endif
 #else /* defined(S2N_MADVISE_SUPPORTED) && defined(MADV_WIPEONFORK) */
     #define MADV_WIPEONFORK 18