diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp
index 3b61bedcab..81452c7b00 100644
--- a/src/thingdef/thingdef_properties.cpp
+++ b/src/thingdef/thingdef_properties.cpp
@@ -167,7 +167,7 @@ INTBOOL CheckActorFlag(const AActor *owner, FFlagDef *fd)
 	{
 		return fd->flagbit & *(DWORD *)(((char*)owner) + fd->structoffset);
 	}
-#ifdef __BID_ENDIAN__
+#ifdef __BIG_ENDIAN__
 	else if (fd->fieldsize == 2)
 	{
 		return fd->flagbit & *(WORD *)(((char*)owner) + fd->structoffset);