diff --git a/Common/MemArena.cpp b/Common/MemArena.cpp
index daa575ffa1..df5cc7282b 100644
--- a/Common/MemArena.cpp
+++ b/Common/MemArena.cpp
@@ -189,7 +189,7 @@ void *MemArena::CreateView(s64 offset, size_t size, void *base)
 // Do not sync memory to underlying file. Linux has this by default.
 #ifdef BLACKBERRY
 		MAP_NOSYNCFILE |
-#elif defined(__FreeBSD__)
+#elif defined(__DragonFly__) || defined(__FreeBSD__)
 		MAP_NOSYNC |
 #endif
 		((base == 0) ? 0 : MAP_FIXED), fd, offset);