diff --git a/src/cmd/go/testdata/script/mod_off_init.txt b/src/cmd/go/testdata/script/mod_off_init.txt
index 8dd4bb028c..f9a4e10bd4 100644
--- a/src/cmd/go/testdata/script/mod_off_init.txt
+++ b/src/cmd/go/testdata/script/mod_off_init.txt
@@ -4,4 +4,4 @@ env GO111MODULE=off
 # GO111MODULE=off when outside of GOPATH will fatal
 # with an error message.
 ! go mod init
-stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+stderr 'go mod init: modules disabled by GO111MODULE=off; see ''go help modules'''