diff --git a/mozilla/config/rules.mak b/mozilla/config/rules.mak
index 353880fa25f..f15bae93aa2 100644
--- a/mozilla/config/rules.mak
+++ b/mozilla/config/rules.mak
@@ -707,9 +707,11 @@ install:: $(XPIDL_GEN_DIR) $(TYPELIB)
 GARBAGE=$(GARBAGE) $(XPIDL_GEN_DIR) $(DIST)\bin\components\$(MODULE).xpt
 
 clobber::
+        -for %g in ($(XPIDLSRCS:.idl=.h)) do $(RM) $(XPDIST:/=\)\include\%g
         -$(RM_R) $(GARBAGE) 2> NUL
 
 clobber_all::
+        -for %g in ($(XPIDLSRCS:.idl=.h)) do $(RM) $(XPDIST:/=\)\include\%g
         -$(RM_R) $(GARBAGE) 2> NUL
 
 GARBAGE=$(GARBAGE) $(XPIDL_GEN_DIR) $(DIST)\bin\components\$(XPIDL_MODULE).xpt