diff --git a/cmd/cue/cmd/fix.go b/cmd/cue/cmd/fix.go
index ae57c567869..9273f4d57ef 100644
--- a/cmd/cue/cmd/fix.go
+++ b/cmd/cue/cmd/fix.go
@@ -89,7 +89,7 @@ func runFixAll(cmd *Command, args []string) error {
 
 	for _, i := range instances {
 		for _, f := range i.Files {
-			if done[f] || !strings.HasSuffix(f.Filename, ".cue") {
+			if done[f] || (f.Filename != "-" && !strings.HasSuffix(f.Filename, ".cue")) {
 				continue
 			}
 			done[f] = true
@@ -99,9 +99,14 @@ func runFixAll(cmd *Command, args []string) error {
 				errs = errors.Append(errs, errors.Promote(err, "format"))
 			}
 
-			err = os.WriteFile(f.Filename, b, 0644)
-			if err != nil {
-				errs = errors.Append(errs, errors.Promote(err, "write"))
+			if f.Filename == "-" {
+				if _, err := cmd.OutOrStdout().Write(b); err != nil {
+					return err
+				}
+			} else {
+				if err := os.WriteFile(f.Filename, b, 0644); err != nil {
+					errs = errors.Append(errs, errors.Promote(err, "write"))
+				}
 			}
 		}
 	}
diff --git a/cmd/cue/cmd/testdata/script/fix.txtar b/cmd/cue/cmd/testdata/script/fix.txtar
index 9221c2f6473..70b78c29cb1 100644
--- a/cmd/cue/cmd/testdata/script/fix.txtar
+++ b/cmd/cue/cmd/testdata/script/fix.txtar
@@ -1,8 +1,14 @@
-exec cue fix ./...
+# Just like other commands, we can fix with stdin/stdout.
+stdin p/three.cue
+exec cue fix -
+cmp stdout p/three.cue.fixed
+
 # Make sure we fix all files in a directory, even if they're a mix of packages (or no packages).
+exec cue fix ./...
 cmp p/one.cue p/one.cue.fixed
 cmp p/two.cue p/two.cue.fixed
 cmp p/three.cue p/three.cue.fixed
+
 -- p/one.cue --
 package one
 
@@ -28,4 +34,4 @@ out: list.Repeat(["baz"], 3)
 -- p/three.cue.fixed --
 import "list"
 
-out: list.Concat([["a"], (list.Concat([(list.Repeat(["a"], 7)), ["gh"]]))])
\ No newline at end of file
+out: list.Concat([["a"], (list.Concat([(list.Repeat(["a"], 7)), ["gh"]]))])