diff --git a/config/makefiles/xpidl/Makefile.in b/config/makefiles/xpidl/Makefile.in
index d2ecda139ceb..d506a60ef725 100644
--- a/config/makefiles/xpidl/Makefile.in
+++ b/config/makefiles/xpidl/Makefile.in
@@ -57,6 +57,8 @@ xpidl_modules := @xpidl_modules@
 linked_xpt_files := $(addprefix $(idl_xpt_dir)/,$(addsuffix .xpt,$(xpidl_modules)))
 depends_files := $(foreach root,$(xpidl_modules),$(idl_deps_dir)/$(root).pp)
 
+GARBAGE += $(linked_xpt_files) $(depends_files)
+
 xpidl:: $(linked_xpt_files)
 
 $(linked_xpt_files): $(process_py) $(call mkdir_deps,$(idl_deps_dir) $(dist_include_dir) $(idl_xpt_dir))
diff --git a/xpcom/xpidl/Makefile.in b/xpcom/xpidl/Makefile.in
index d8440352b92e..621a43aceebc 100644
--- a/xpcom/xpidl/Makefile.in
+++ b/xpcom/xpidl/Makefile.in
@@ -6,3 +6,6 @@ export::
 	$(call SUBMAKE,xpidl-parser,$(DEPTH)/xpcom/idl-parser)
 	$(call py_action,process_install_manifest,$(DIST)/idl $(DEPTH)/_build_manifests/install/dist_idl)
 	$(call SUBMAKE,xpidl,$(DEPTH)/config/makefiles/xpidl)
+
+clean clobber realclean clobber_all distclean::
+	$(call SUBMAKE,$@,$(DEPTH)/config/makefiles/xpidl)