diff --git a/tools/interop_matrix/client_matrix.py b/tools/interop_matrix/client_matrix.py
index 3546d59c313..4964fd61674 100644
--- a/tools/interop_matrix/client_matrix.py
+++ b/tools/interop_matrix/client_matrix.py
@@ -44,7 +44,10 @@ def get_runtimes_for_lang_release(lang, release):
             if release_info[release] is not None:
                 runtimes_to_skip = release_info[release].get('skip_runtime', [])
                 break
-    return [runtime for runtime in LANG_RUNTIME_MATRIX[lang] if runtime not in runtimes_to_skip]
+    return [
+        runtime for runtime in LANG_RUNTIME_MATRIX[lang]
+        if runtime not in runtimes_to_skip
+    ]
 
 
 def should_build_docker_interop_image_from_release_tag(lang):
diff --git a/tools/interop_matrix/run_interop_matrix_tests.py b/tools/interop_matrix/run_interop_matrix_tests.py
index 693996031e3..d75cab90c25 100755
--- a/tools/interop_matrix/run_interop_matrix_tests.py
+++ b/tools/interop_matrix/run_interop_matrix_tests.py
@@ -117,7 +117,8 @@ def _get_test_images_for_lang(lang, release_arg, image_path_prefix):
     images = {}
     for tag in releases:
         for runtime in client_matrix.get_runtimes_for_lang_release(lang, tag):
-            image_name = '%s/grpc_interop_%s:%s' % (image_path_prefix, runtime, tag)
+            image_name = '%s/grpc_interop_%s:%s' % (image_path_prefix, runtime,
+                                                    tag)
             image_tuple = (tag, image_name)
 
             if not images.has_key(runtime):