diff --git a/lib/util/arc4random.h b/lib/util/arc4random.h
index e6efa1d5d..badb88ad5 100644
--- a/lib/util/arc4random.h
+++ b/lib/util/arc4random.h
@@ -45,12 +45,8 @@ static pthread_mutex_t arc4random_mtx = PTHREAD_MUTEX_INITIALIZER;
 # define _ARC4_ATFORK(f)
 #endif
 
-#if !defined(MAP_ANON)
-# if defined(MAP_ANONYMOUS)
-#  define MAP_ANON MAP_ANONYMOUS
-# elif defined(MAP_SGI_ANYADDR)
-#  define MAP_ANON MAP_SGI_ANYADDR
-# endif
+#if !defined(MAP_ANON) && defined(MAP_ANONYMOUS)
+# define MAP_ANON MAP_ANONYMOUS
 #endif
 
 static inline void
diff --git a/lib/util/getentropy.c b/lib/util/getentropy.c
index 1f2e34afb..dc00d36b5 100644
--- a/lib/util/getentropy.c
+++ b/lib/util/getentropy.c
@@ -69,12 +69,8 @@
 #include "sudo_digest.h"
 #include "sudo_rand.h"
 
-#if !defined(MAP_ANON)
-# if defined(MAP_ANONYMOUS)
-#  define MAP_ANON MAP_ANONYMOUS
-# elif defined(MAP_SGI_ANYADDR)
-#  define MAP_ANON MAP_SGI_ANYADDR
-# endif
+#if !defined(MAP_ANON) && defined(MAP_ANONYMOUS)
+# define MAP_ANON MAP_ANONYMOUS
 #endif
 
 #define REPEAT 5