diff --git a/Lib/warnings.py b/Lib/warnings.py
index 13ad6c8aacbb7f..1952c9e021074d 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -422,7 +422,7 @@ def warn_explicit(message, category, filename, lineno,
     linecache.getlines(filename, module_globals)
 
     # Print message and context
-    msg = WarningMessage(message, category, filename, lineno, source)
+    msg = WarningMessage(message, category, filename, lineno,None, source) # Adding None due to positional arguments of WarningMessage()
     _showwarnmsg(msg)