diff --git a/test/test_compressor.py b/test/test_compressor.py
index 47c7f68b74ec45a290fb1b96c95a535438e3a7f5..da658d55755ff1e7288ef6604052745fb951246c 100644
--- a/test/test_compressor.py
+++ b/test/test_compressor.py
@@ -11,11 +11,11 @@ class CompressorTest(unittest.TestCase):
     def setUp(self):
         """Load a json to use as testdata."""
         with open("soitool/testdata/codebook.json", "r") as file:
-            self.soi = json.load(file)
+            self.original = json.load(file)
 
     def test_compress(self):
         """Test compression returns ascii and reduces size."""
-        compressed = compress(self.soi)
+        compressed = compress(self.original)
 
         # Test if compressed is ascii
         def is_ascii(string):
@@ -25,14 +25,14 @@ class CompressorTest(unittest.TestCase):
         self.assertTrue(is_ascii(compressed))
 
         # Test if size is reduced
-        smaller = len(compressed) < len(str(self.soi))
+        smaller = len(compressed) < len(str(self.original))
         self.assertTrue(smaller)
 
     def test_decompress(self):
         """Test decompression returns same as original."""
-        compressed = compress(self.soi)
+        compressed = compress(self.original)
         decompressed = decompress(compressed)
-        self.assertEqual(decompressed, self.soi)
+        self.assertEqual(decompressed, self.original)
 
 
 if __name__ == "__main__":