diff --git a/src/cmd/compile/internal/types/goversion.go b/src/cmd/compile/internal/types/goversion.go
index c57493a5cb2a6..ac08a49d0cab7 100644
--- a/src/cmd/compile/internal/types/goversion.go
+++ b/src/cmd/compile/internal/types/goversion.go
@@ -34,7 +34,7 @@ func AllowsGoVersion(major, minor int) bool {
 }
 
 // ParseLangFlag verifies that the -lang flag holds a valid value, and
-// exits if not. It initializes data used by langSupported.
+// exits if not. It initializes data used by AllowsGoVersion.
 func ParseLangFlag() {
 	if base.Flag.Lang == "" {
 		return
@@ -59,6 +59,10 @@ func ParseLangFlag() {
 
 // parseLang parses a -lang option into a langVer.
 func parseLang(s string) (lang, error) {
+	if s == "go1" { // cmd/go's new spelling of "go1.0" (#65528)
+		s = "go1.0"
+	}
+
 	matches := goVersionRE.FindStringSubmatch(s)
 	if matches == nil {
 		return lang{}, fmt.Errorf(`should be something like "go1.12"`)
diff --git a/src/cmd/go/testdata/script/build_issue_65528.txt b/src/cmd/go/testdata/script/build_issue_65528.txt
new file mode 100644
index 0000000000000..ab4d62bbb2b47
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_issue_65528.txt
@@ -0,0 +1,9 @@
+go build
+
+-- go.mod --
+module test
+
+go 1.0
+
+-- p.go --
+package p