diff --git a/core/Makefile b/core/Makefile
index c227d80..c6fbe61 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -54,7 +54,7 @@ ifeq "$(ENGINE)" "left4dead"
 	override ENGSET = true
 endif
 
-CFLAGS += -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
+CFLAGS += -DSE_DARKMESSIAH=2 -DSE_ORANGEBOX=3 -DSE_LEFT4DEAD=4
 
 LINK += $(HL2LIB)/tier1_i486.a vstdlib_i486.so tier0_i486.so -static-libgcc