diff --git a/src/cmd/go/alldocs.go b/src/cmd/go/alldocs.go
index 30d1a095fe..e92d293ccd 100644
--- a/src/cmd/go/alldocs.go
+++ b/src/cmd/go/alldocs.go
@@ -928,7 +928,7 @@
 // 		Indirect bool
 // 	}
 //
-// 	type Replace string {
+// 	type Replace struct {
 // 		Old Module
 // 		New Module
 // 	}
diff --git a/src/cmd/go/internal/modcmd/mod.go b/src/cmd/go/internal/modcmd/mod.go
index d01f699d88..ec93431085 100644
--- a/src/cmd/go/internal/modcmd/mod.go
+++ b/src/cmd/go/internal/modcmd/mod.go
@@ -99,7 +99,7 @@ Go types:
 		Indirect bool
 	}
 	
-	type Replace string {
+	type Replace struct {
 		Old Module
 		New Module
 	}