diff --git a/src/spdx.adb b/src/spdx.adb
index 094c304..570de54 100644
--- a/src/spdx.adb
+++ b/src/spdx.adb
@@ -77,16 +77,15 @@ package body SPDX is
             return;
          end if;
 
-         if This.Tokens.Is_Empty
-           or else
-             This.Tokens.First_Element.Kind /= Paren_Close
-         then
+         if This.Tokens.Is_Empty then
             This.Error := Paren_Close_Expected;
-            This.Err_Loc := This.Tokens.First_Element.Loc;
+            This.Err_Loc := (This.Str'Last, This.Str'Last);
             return;
          end if;
 
-         if This.Tokens.Is_Empty then
+         if This.Tokens.First_Element.Kind /= Paren_Close then
+            This.Error := Paren_Close_Expected;
+            This.Err_Loc := This.Tokens.First_Element.Loc;
             return;
          end if;
 
diff --git a/src/spdx.ads b/src/spdx.ads
index ccc9799..a0c9912 100644
--- a/src/spdx.ads
+++ b/src/spdx.ads
@@ -18,15 +18,15 @@ package SPDX is
      with Pre => Valid (This);
    --  Return the string representation of a valid SPDX expression
 
-   subtype Id_String is String
-     with Dynamic_Predicate => (for all C of Id_String => C in Id_Characters);
-
 private
 
    subtype Id_Characters is Character
      with Dynamic_Predicate => Id_Characters in
        'a' .. 'z' | 'A' .. 'Z' | '0' .. '9' | '-' | '.';
 
+   subtype Id_String is String
+     with Dynamic_Predicate => (for all C of Id_String => C in Id_Characters);
+
    subtype Whitespace_Characters is Character
      with Dynamic_Predicate => Whitespace_Characters in
        ' ' | ASCII.HT;
diff --git a/tests/src/main.adb b/tests/src/main.adb
index 136c4cb..be2ae1a 100644
--- a/tests/src/main.adb
+++ b/tests/src/main.adb
@@ -80,7 +80,7 @@ begin
    Test ("MIT OR", "Empty license expression at (6:6)");
    Test ("MIT MIT", "Unexpected token at (5:7)");
 
-   Test ("(MIT", "Missing closing parentheses ')' at (2:4)");
+   Test ("(MIT", "Missing closing parentheses ')' at (4:4)");
    Test ("MIT)", "Unexpected token at (4:4)");
    Test ("(MIT AND (MIT OR MIT)", "Missing closing parentheses ')' at (21:21)");
    Test ("MIT AND (MIT OR MIT))", "Unexpected token at (21:21)");