diff --git a/sphinx/directives/other.py b/sphinx/directives/other.py
index 8caef4f05fb..20fb05b5048 100644
--- a/sphinx/directives/other.py
+++ b/sphinx/directives/other.py
@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import re
+from os.path import abspath
 from typing import TYPE_CHECKING, Any, cast
 
 from docutils import nodes
@@ -386,7 +387,7 @@ def _insert_input(include_lines, source):
             text = "\n".join(include_lines[:-2])
 
             # The docname to pass into the source-read event
-            docname = self.env.path2doc(os_path(source))
+            docname = self.env.path2doc(abspath(os_path(source)))
             # Emit the "source-read" event
             arg = [text]
             self.env.app.events.emit("source-read", docname, arg)