diff --git a/test/osbuildtest.py b/test/osbuildtest.py
index f9c4745c..489766be 100644
--- a/test/osbuildtest.py
+++ b/test/osbuildtest.py
@@ -32,7 +32,7 @@ class TestCase(unittest.TestCase):
         if not os.getenv("OSBUILD_TEST_STORE"):
             shutil.rmtree(self.store)
 
-    def run_osbuild(self, pipeline, input=None):
+    def run_osbuild(self, pipeline, input_data=None):
         osbuild_cmd = ["python3", "-m", "osbuild", "--json", "--store", self.store, "--libdir", ".", pipeline]
 
         build_env = os.getenv("OSBUILD_TEST_BUILD_ENV", None)
@@ -43,8 +43,8 @@ class TestCase(unittest.TestCase):
         # Create a checkpoint at the last stage, i.e.
         # commit the final tree to the store, so that
         # tests can use it to compare against
-        if input:
-            manifest = json.loads(input)
+        if input_data:
+            manifest = json.loads(input_data)
         else:
             with open(pipeline, "r") as f:
                 manifest = json.load(f)
@@ -54,11 +54,11 @@ class TestCase(unittest.TestCase):
             osbuild_cmd.append("--checkpoint")
             osbuild_cmd.append(parsed.tree_id)
 
-        stdin = subprocess.PIPE if input else None
+        stdin = subprocess.PIPE if input_data else None
 
         p = subprocess.Popen(osbuild_cmd, encoding="utf-8", stdin=stdin, stdout=subprocess.PIPE)
         try:
-            output, _ = p.communicate(input)
+            output, _ = p.communicate(input_data)
             if p.returncode != 0:
                 print(output)
             self.assertEqual(p.returncode, 0)
diff --git a/test/test_assemblers.py b/test/test_assemblers.py
index ddcffa40..9e8bc45e 100644
--- a/test/test_assemblers.py
+++ b/test/test_assemblers.py
@@ -20,7 +20,7 @@ class TestAssemblers(osbuildtest.TestCase):
         with open("test/pipelines/f30-base.json") as f:
             base = json.load(f)
         base["pipeline"] = dict(base["pipeline"], assembler={"name": name, "options": options})
-        return self.run_osbuild("-", input=json.dumps(base))
+        return self.run_osbuild("-", input_data=json.dumps(base))
 
     def assertImageFile(self, filename, fmt, expected_size=None):
         info = json.loads(subprocess.check_output(["qemu-img", "info", "--output", "json", filename]))