diff --git a/pricing/pricing.py b/pricing/pricing.py
index 9c6f60a..e180a84 100644
--- a/pricing/pricing.py
+++ b/pricing/pricing.py
@@ -59,7 +59,7 @@ async def pricing_program_charging(sor, pricing_program_id, data):
 		elif spec.pricing_spec_mode == 'spec_amount':
 			if charge.pricing_unit is None or charge.pricing_unit < 1:
 				charge.pricing_unit = 1
-			charge.amount = d * charge_amount / charge.pricing_unit
+			charge.amount = d * charge.pricing_amount / charge.pricing_unit
 			charges.append(charge)
 		elif spec.pricing_spec_mode == 'remote_pricing':
 			charge.amount = await get_remote_pricing(sor, charge, params=d)