diff --git a/src/pkg/go/types/Makefile b/src/pkg/go/types/Makefile
index 4ca707c735..d21ebc128f 100644
--- a/src/pkg/go/types/Makefile
+++ b/src/pkg/go/types/Makefile
@@ -14,3 +14,5 @@ GOFILES=\
 	universe.go\
 
 include ../../../Make.pkg
+
+CLEANFILES+=testdata/exports.[$(OS)]