diff --git a/engine/server/sv_game.c b/engine/server/sv_game.c
index 64bca6b8d..29d53549f 100644
--- a/engine/server/sv_game.c
+++ b/engine/server/sv_game.c
@@ -3064,7 +3064,7 @@ void SV_SetStringArrayMode( qboolean dynamic )
 #endif
 }
 
-#if XASH_64BIT && !XASH_WIN32 && !XASH_APPLE && !XASH_NSWITCH && !XASH_ANDROID
+#if XASH_AMD64 && XASH_LINUX && !XASH_ANDROID
 #define USE_MMAP
 #include <sys/mman.h>
 #endif