diff --git a/project/arch.mk b/project/arch.mk
index 7040e88..aa84a15 100644
--- a/project/arch.mk
+++ b/project/arch.mk
@@ -1,9 +1,5 @@
-# mingw
-ifeq ($(ARCH),w32)
-	ARCH = nt32
-else ifeq ($(ARCH),w64)
-	ARCH = nt64
-endif
+# nt32/nt64
+ARCH = nt$(CC_BITS)
 
 # process
 src/process/%.lo: $(SOURCE_DIR)/src/process/$(ARCH)/%.s $(ALL_HEADERS) host.tag tree.tag