diff --git a/src/cmd/go/testdata/script/generate_env.txt b/src/cmd/go/testdata/script/generate_env.txt
index 0d3693fa33..2df1663376 100644
--- a/src/cmd/go/testdata/script/generate_env.txt
+++ b/src/cmd/go/testdata/script/generate_env.txt
@@ -1,7 +1,8 @@
 # Install an env command because Windows and plan9 don't have it.
 env GOBIN=$WORK/tmp/bin
 go install env.go
-env PATH=$GOBIN${:}$PATH
+[plan9] env path=$GOBIN${:}$path
+[!plan9] env PATH=$GOBIN${:}$PATH
 
 # Test generators have access to the environment
 go generate ./printenv.go
diff --git a/src/cmd/go/testdata/script/mod_gomodcache.txt b/src/cmd/go/testdata/script/mod_gomodcache.txt
index 67a8f07b2c..b2143e2093 100644
--- a/src/cmd/go/testdata/script/mod_gomodcache.txt
+++ b/src/cmd/go/testdata/script/mod_gomodcache.txt
@@ -24,7 +24,8 @@ grep '{"Version":"v1.0.0","Time":"2018-02-14T00:45:20Z"}' $GOPATH/pkg/mod/cache/
 
 # If neither GOMODCACHE or GOPATH are set, GOPATH defaults to the user's $HOME/go, so GOMODCACHE becomes $HOME/go/pkg/mod
 [windows] env USERPROFILE=$WORK/home # Ensure USERPROFILE is a valid path (rather than /no-home/ so we don't run into the logic that "uninfers" GOPATH in cmd/go/main.go
-[!windows] env HOME=$WORK/home
+[plan9] env home=$WORK/home
+[!windows] [!plan9] env HOME=$WORK/home
 env GOMODCACHE=
 env GOPATH=
 go env GOMODCACHE