diff --git a/mk/environ.mk b/mk/environ.mk
index 362696c6b2..452a0acd54 100644
--- a/mk/environ.mk
+++ b/mk/environ.mk
@@ -64,7 +64,7 @@ endif
 # Work out where we are going to be building things
 #
 TMPDIR			?=	/tmp
-BUILDROOT		:=	$(abspath $(TMPDIR)/$(SKETCH).build)
+BUILDROOT		:=	$(SKETCHBOOK)/Build.$(SKETCH)
 ifneq ($(findstring CYGWIN, $(SYSTYPE)),)
   # Workaround a $(abspath ) bug on cygwin
   ifeq ($(BUILDROOT),)