diff --git a/Makefile.macosx b/Makefile.macosx
index 502fa10..7c3f879 100644
--- a/Makefile.macosx
+++ b/Makefile.macosx
@@ -10,7 +10,7 @@ LIBTARGET = lib$(NAME)
 LLTDIR = llt
 LLT = $(LLTDIR)/libllt.a
 
-CONFIG = -DMACOSX -DARCH_X86_64 -DBITS64 -D__CPU__=686 -I$(CARBON_HEADERS)
+CONFIG = -DBITS64 -D__CPU__=686 -I$(CARBON_HEADERS)
 FLAGS = -falign-functions -Wall -Wno-strict-aliasing -I$(LLTDIR) $(CFLAGS) -DUSE_COMPUTED_GOTO $(CONFIG)
 LIBFILES = $(LLT)
 LIBS = $(LIBFILES) -lm -framework ApplicationServices
diff --git a/llt/Makefile.macosx b/llt/Makefile.macosx
index 5fb5353..f20ffc5 100644
--- a/llt/Makefile.macosx
+++ b/llt/Makefile.macosx
@@ -9,7 +9,7 @@ TARGET = libllt.a
 
 # OS flags: LINUX, WIN32, MACOSX
 # architecture flags: __CPU__=xxx, BITS64, ARCH_X86, ARCH_X86_64
-CONFIG = -DMACOSX -DARCH_X86_64 -DBITS64 -D__CPU__=686
+CONFIG = -DBITS64 -D__CPU__=686
 FLAGS = -Wall -Wno-strict-aliasing $(CFLAGS) $(CONFIG)
 LIBS =