diff --git a/src/pkg/go/build/Makefile b/src/pkg/go/build/Makefile
index 4411940ae4f..5bb2c86ed2e 100644
--- a/src/pkg/go/build/Makefile
+++ b/src/pkg/go/build/Makefile
@@ -11,7 +11,7 @@ GOFILES=\
 	path.go\
 	syslist.go\
 
-CLEANFILES+=syslist.go
+CLEANFILES+=syslist.go cgotest/_obj
 
 include ../../../Make.pkg