diff --git a/Make.defs b/Make.defs
index c62999804..f7e6aa08d 100644
--- a/Make.defs
+++ b/Make.defs
@@ -37,9 +37,9 @@
 BUILTIN_REGISTRY = $(APPDIR)$(DELIM)builtin$(DELIM)registry
 
 ifeq ($(CONFIG_NUTTX_NEWCONFIG),y)
-DEPCONFIG = $(TOPDIR)/.config
+DEPCONFIG = $(TOPDIR)$(DELIM).config
 else
-DEPCONFIG = $(TOPDIR)/.config $(APPDIR)/.config
+DEPCONFIG = $(TOPDIR)$(DELIM).config $(APPDIR)$(DELIM).config
 endif
 
 define REGISTER
diff --git a/builtin/Makefile b/builtin/Makefile
index ccb860c88..8c8928886 100644
--- a/builtin/Makefile
+++ b/builtin/Makefile
@@ -75,10 +75,10 @@ $(AOBJS): %$(OBJEXT): %.S
 $(COBJS): %$(OBJEXT): %.c
 	$(call COMPILE, $<, $@)
 
-registry/.updated:
+registry$(DELIM).updated:
 	$(V) $(MAKE) -C registry .updated TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)"
 
-builtin_list.h: registry/.updated
+builtin_list.h: registry$(DELIM).updated
 	$(call DELFILE, builtin_list.h)
 	$(Q) touch builtin_list.h
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)
@@ -92,7 +92,7 @@ else
 	)
 endif
 
-builtin_proto.h: registry/.updated
+builtin_proto.h: registry$(DELIM).updated
 	$(call DELFILE, builtin_proto.h)
 	$(Q) touch builtin_proto.h
 ifeq ($(CONFIG_WINDOWS_NATIVE),y)