diff --git a/src/ld65/lineinfo.c b/src/ld65/lineinfo.c
index 5c4a22cdd..180bfdf90 100644
--- a/src/ld65/lineinfo.c
+++ b/src/ld65/lineinfo.c
@@ -142,9 +142,10 @@ void ReadLineInfoList (FILE* F, ObjData* O, Collection* LineInfos)
          * therefore be part of the line infos read from the object file.
          */
         if (LineInfoIndex >= CollCount (&O->LineInfos)) {
-            Internal ("Invalid line info index %u in module `%s'",
+            Internal ("Invalid line info index %u in module `%s' - max is %u",
                       LineInfoIndex,
-                      GetObjFileName (O));
+                      GetObjFileName (O),
+                      CollCount (&O->LineInfos));
         }
 
         /* Add the line info to the collection */