diff --git a/.cvsignore b/.cvsignore
index ceb8a91d93c..48609942060 100644
--- a/.cvsignore
+++ b/.cvsignore
@@ -8,3 +8,4 @@ buildno
 python
 build
 Makefile.pre
+platform
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 0354849404b..c6a053ebe24 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -763,7 +763,7 @@ clobber: clean
 	-rm -f $(PYTHON) $(PGEN) $(LIBRARY) $(LDLIBRARY) $(DLLLIBRARY) \
 		tags TAGS \
 		config.cache config.log config.h Modules/config.c 
-	-rm -rf build
+	-rm -rf build platform
 
 # Make things extra clean, before making a distribution:
 # remove all generated files, even Makefile[.pre]