diff --git a/src/cmd/go/testdata/script/gotoolchain_net.txt b/src/cmd/go/testdata/script/gotoolchain_net.txt
index 7d92b72315..d04229d293 100644
--- a/src/cmd/go/testdata/script/gotoolchain_net.txt
+++ b/src/cmd/go/testdata/script/gotoolchain_net.txt
@@ -24,6 +24,15 @@ stderr 'go: downloading go1.999testmod \(.*/.*\)'
 env GOPROXY=
 env GOSUMDB=
 env GOTOOLCHAIN=go1.20.1
+
+	# Avoid resolving a "go1.20.1" from the user's real $PATH.
+	# That would not only cause the "downloading go1.20.1" message
+	# to be suppressed, but may spuriously fail:
+	# golang.org/dl/go1.20.1 expects to find its GOROOT in $HOME/sdk,
+	# but the script environment sets HOME=/no-home.
+env PATH=
+env path=
+
 go version
 stderr '^go: downloading go1.20.1 '
 stdout go1.20.1