diff --git a/tools/lib/subcmd/Makefile b/tools/lib/subcmd/Makefile
index ce4b7e5..3f8cc44 100644
--- a/tools/lib/subcmd/Makefile
+++ b/tools/lib/subcmd/Makefile
@@ -2,7 +2,7 @@
 include ../../scripts/utilities.mak		# QUIET_CLEAN
 
 ifeq ($(srctree),)
-srctree := $(patsubst %/,%,$(dir $(shell pwd)))
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 srctree := $(patsubst %/,%,$(dir $(srctree)))
 #$(info Determined 'srctree' to be $(srctree))