diff --git a/plugin_test.py b/plugin_test.py
index 1b32b6c..c52315a 100644
--- a/plugin_test.py
+++ b/plugin_test.py
@@ -132,6 +132,30 @@ def test_warning():
     assert not result.stderr.lines
 
 
+def test_annotation_warning_cwd(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("GITHUB_WORKSPACE", os.path.dirname(str(testdir.tmpdir)))
+    testdir.mkdir("foo")
+    testdir.makefile(".ini", pytest="[pytest]\ntestpaths=..")
+    result = testdir.runpytest_subprocess("--rootdir=foo")
+    result.stderr.fnmatch_lines(
+        [
+            "::warning file=test_annotation_warning_cwd0/test_annotation_warning_cwd.py,line=6::beware",
+        ]
+    )
+
+
 def test_annotation_third_party_exception(testdir: pytest.Testdir):
     testdir.makepyfile(
         my_module="""
diff --git a/pytest_github_actions_annotate_failures/plugin.py b/pytest_github_actions_annotate_failures/plugin.py
index 7f2f4cf..bc18968 100644
--- a/pytest_github_actions_annotate_failures/plugin.py
+++ b/pytest_github_actions_annotate_failures/plugin.py
@@ -113,7 +113,7 @@ def pytest_warning_recorded(
             return
 
         filesystempath = warning_message.filename
-        workspace = os.environ.get("GITHUB_WORKFLOW")
+        workspace = os.environ.get("GITHUB_WORKSPACE")
 
         if workspace:
             try: