diff --git a/source/build/src/defs.cpp b/source/build/src/defs.cpp
index 3d79dd4f1..a85694988 100644
--- a/source/build/src/defs.cpp
+++ b/source/build/src/defs.cpp
@@ -3196,7 +3196,7 @@ static int32_t defsparser(scriptfile *script)
 
 
         default:
-            pos.Message(MSG_ERROR, "Unknown token."); break;
+            pos.Message(MSG_ERROR, "%s: Unknown token.", script->String); break;
         }
     }