diff --git a/plugin_test.py b/plugin_test.py
index 5231b29..d148856 100644
--- a/plugin_test.py
+++ b/plugin_test.py
@@ -213,6 +213,28 @@ def test_warning():
     )
 
 
+def test_annotation_warning_runpath(testdir: pytest.Testdir):
+    testdir.makepyfile(
+        """
+        import warnings
+        import pytest
+        pytest_plugins = 'pytest_github_actions_annotate_failures'
+
+        def test_warning():
+            warnings.warn('beware', Warning)
+            assert 1
+        """
+    )
+    testdir.monkeypatch.setenv("GITHUB_ACTIONS", "true")
+    testdir.monkeypatch.setenv("PYTEST_RUN_PATH", "some_path")
+    result = testdir.runpytest_subprocess()
+    result.stderr.fnmatch_lines(
+        [
+            "::warning file=some_path/test_annotation_warning_runpath.py,line=6::beware",
+        ]
+    )
+
+
 def test_annotation_fail_disabled_outside_workflow(testdir: pytest.Testdir):
     testdir.makepyfile(
         """
diff --git a/pytest_github_actions_annotate_failures/plugin.py b/pytest_github_actions_annotate_failures/plugin.py
index fc493eb..061f167 100644
--- a/pytest_github_actions_annotate_failures/plugin.py
+++ b/pytest_github_actions_annotate_failures/plugin.py
@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import contextlib
 import os
 import sys
 from typing import TYPE_CHECKING
@@ -110,25 +109,9 @@ def pytest_warning_recorded(
         if os.environ.get("GITHUB_ACTIONS") != "true":
             return
 
-        filesystempath = warning_message.filename
-        workspace = os.environ.get("GITHUB_WORKSPACE")
-
-        if workspace:
-            try:
-                rel_path = os.path.relpath(filesystempath, workspace)
-            except ValueError:
-                # os.path.relpath() will raise ValueError on Windows
-                # when full_path and workspace have different mount points.
-                rel_path = filesystempath
-            if not rel_path.startswith(".."):
-                filesystempath = rel_path
-        else:
-            with contextlib.suppress(ValueError):
-                filesystempath = os.path.relpath(filesystempath)
-
         workflow_command = _build_workflow_command(
             "warning",
-            filesystempath,
+            compute_path(os.path.relpath(warning_message.filename)),
             warning_message.lineno,
             message=str(warning_message.message),
         )