diff --git a/Lib/warnings.py b/Lib/warnings.py
index 13ad6c8aacbb7f..df844253ab4e6d 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, source=source)
     _showwarnmsg(msg)
 
 
diff --git a/Misc/NEWS.d/next/Library/2025-03-17-15-45-36.gh-issue-129843.NPdpXL.rst b/Misc/NEWS.d/next/Library/2025-03-17-15-45-36.gh-issue-129843.NPdpXL.rst
new file mode 100644
index 00000000000000..c16d61540edf39
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-17-15-45-36.gh-issue-129843.NPdpXL.rst
@@ -0,0 +1 @@
+Fix incorrect argument passing in :func:`warnings.warn_explicit`.