diff --git a/library/src/calculator_functions.cpp b/library/src/calculator_functions.cpp
index f7cb568..97e0b2e 100644
--- a/library/src/calculator_functions.cpp
+++ b/library/src/calculator_functions.cpp
@@ -509,5 +509,6 @@ double Calculator::GetCostFromDuration(Configuration* cfg, uint8_t payment_optio
 
 	double ret_val = total_cost;
 	total_cost = 0.0f;
-	return floor(ret_val);
+    // return ceil(ret_val);
+    return floor(ret_val);
 }