diff --git a/src/filter_editor.py b/src/filter_editor.py
index 27d91b6..09dbe95 100644
--- a/src/filter_editor.py
+++ b/src/filter_editor.py
@@ -149,7 +149,7 @@ def filter_callable(x):
                 return value == x
         elif filter_option == FilterOption.contains:
             def filter_callable(x):
-                return value in x
+                return value.lower() in x.lower()
         else:
             raise ValueError('Invalid FilterOption!')