diff --git a/Config.mk b/Config.mk
index 259e68863d..eb28e498be 100644
--- a/Config.mk
+++ b/Config.mk
@@ -63,7 +63,7 @@ DEPS_INCLUDE = $(addsuffix .d2, $(basename $(wildcard $(DEPS))))
 DEPS_RM = $(DEPS) $(DEPS_INCLUDE)
 
 %.d2: %.d
-	sed "s! $$PWD/! !" $^ >$@.tmp && mv -f $@.tmp $@
+	sed "s!\(^\| \)$$PWD/! !" $^ >$@.tmp && mv -f $@.tmp $@
 
 include $(XEN_ROOT)/config/$(XEN_OS).mk
 include $(XEN_ROOT)/config/$(XEN_TARGET_ARCH).mk