diff --git a/python/extractor/semmle/path_rename.py b/python/extractor/semmle/path_rename.py
index 3a72d41e971..39832d6d96a 100644
--- a/python/extractor/semmle/path_rename.py
+++ b/python/extractor/semmle/path_rename.py
@@ -25,7 +25,7 @@ def renamer_from_options_and_env(options, logger):
         except (AttributeError, ImportError):
             raise SemmleError("Cannot get renamer from module " + options.renamer)
     else:
-        path_transformer = os.environ.get("SEMMLE_PATH_TRANSFORMER", None)
+        path_transformer = os.environ.get("CODEQL_PATH_TRANSFORMER", None) or os.environ.get("SEMMLE_PATH_TRANSFORMER", None)
         if path_transformer:
             logger.info("Using path transformer '%s'", path_transformer)
             rename = projectlayout.get_renamer(path_transformer)
diff --git a/python/extractor/tests/test_use_projectlayout.py b/python/extractor/tests/test_use_projectlayout.py
index fde36016f97..a573044b0b4 100644
--- a/python/extractor/tests/test_use_projectlayout.py
+++ b/python/extractor/tests/test_use_projectlayout.py
@@ -19,7 +19,7 @@ class ProjectLayoutUseTest(ExtractorTest):
 
     def test_invalid_layout(self):
         try:
-            with environment("SEMMLE_PATH_TRANSFORMER", "nonsuch/project-layout"):
+            with environment("CODEQL_PATH_TRANSFORMER", "nonsuch/project-layout"):
                 self.run_extractor("-R", self.src_path)
         except subprocess.CalledProcessError as ex:
             self.assertEqual(ex.returncode, 2)