diff --git a/ui (gen4)/Makefile b/ui (gen4)/Makefile
index 9b2d3b4f..d166dfda 100755
--- a/ui (gen4)/Makefile	
+++ b/ui (gen4)/Makefile	
@@ -77,15 +77,14 @@ else
 		TARGET_OS = darwin
 	endif
 
-	# XXX do we need this on a mac???
 	# set arch...
-	#ifeq ($(shell uname -p),x86_64)
-	#	ARCH ?= x64
-	#endif
-	#ifneq ($(filter %86,$(shell uname -p)),)
-	#	ARCH ?= ia32
-	#endif
-	ARCH ?= x64
+	# XXX do we need this on a mac???
+	ifeq ($(shell uname -m),x86_64)
+		ARCH ?= x64
+	endif
+	ifneq ($(filter %86,$(shell uname -p)),)
+		ARCH ?= ia32
+	endif
 endif