diff --git a/format/format.go b/format/format.go
index 7316eb7..64e5c15 100644
--- a/format/format.go
+++ b/format/format.go
@@ -978,10 +978,8 @@ func (f *fumpter) joinStdImports(d *ast.GenDecl) {
 		case periodIndex > 0 && (slashIndex == -1 || periodIndex < slashIndex),
 
 			// "test" and "example" are reserved as per golang.org/issue/37641.
-			// "internal" is unreachable.
 			strings.HasPrefix(path, "test/"),
 			strings.HasPrefix(path, "example/"),
-			strings.HasPrefix(path, "internal/"),
 
 			// See if we match modulePrefix; see its documentation above.
 			// We match either exactly or with a slash suffix,
diff --git a/testdata/script/std-imports.txtar b/testdata/script/std-imports.txtar
index 4053ae7..6b39d89 100644
--- a/testdata/script/std-imports.txtar
+++ b/testdata/script/std-imports.txtar
@@ -160,10 +160,11 @@ import (
 // All of the extra imports below are known to not belong in std.
 // For example/ and test/, see https://golang.org/issue/37641.
 import (
+	"internal/bar"
 	"io"
 
 	"example/foo"
-	"internal/bar"
+
 	"test/baz"
 )