diff --git a/ucl/builtins/strs.go b/ucl/builtins/strs.go
index 33eb4e9..a10893d 100644
--- a/ucl/builtins/strs.go
+++ b/ucl/builtins/strs.go
@@ -41,5 +41,5 @@ func trim(ctx context.Context, args ucl.CallArgs) (any, error) {
 		return nil, err
 	}
 
-	return strings.ToLower(s), nil
+	return strings.TrimSpace(s), nil
 }