diff --git a/test_convert_command.py b/test_convert_command.py
index a20df31..7bd7e47 100644
--- a/test_convert_command.py
+++ b/test_convert_command.py
@@ -30,6 +30,7 @@
             "-type", "truecolor",
             "-define", "colorspace:auto-grayscale=off",
         ]
+        self.expected_filter_options = []
         self.expected_output_options = [
             ")",
             "-gravity", "center",