diff --git a/pricing/pricing.py b/pricing/pricing.py
index 9fd431f..557d52d 100644
--- a/pricing/pricing.py
+++ b/pricing/pricing.py
@@ -153,7 +153,7 @@ def check_value(field, spec_value, data_value):
 	if not mode or mode == '=':
 		mode = '=='
 	ns = {
-		"a": data_value
+		"a": data_value,
 		"b": typevalue(spec_value, field.type)
 	}
 	script = f'a {mode} b'