diff --git a/code/modules/cargo/exports/materials.dm b/code/modules/cargo/exports/materials.dm
index 59b2b7f157b..c38f74e228d 100644
--- a/code/modules/cargo/exports/materials.dm
+++ b/code/modules/cargo/exports/materials.dm
@@ -139,7 +139,7 @@
 		return
 	if(!dry_run)
 		SSstock_market.materials_quantity[material_id] += amount
-		SSstock_market.materials_prices[material_id] -= round((SSstock_market.materials_prices[material_id]) * (amount / (SSstock_market.materials_quantity[material_id])))
+		SSstock_market.materials_prices[material_id] -= round((SSstock_market.materials_prices[material_id]) * (amount / SSstock_market.materials_quantity[material_id]))
 		//This formula should impact lower quantity materials greater, and higher quantity materials less. Still, it's  a bit rough. Tweaking may be needed.
 
 
@@ -160,5 +160,5 @@
 	var/obj/item/stock_block/sold_block = sold_item
 	var/sale_value = sold_block.export_value
 	SSstock_market.materials_quantity[sold_block.export_mat] += sold_block.quantity
-	SSstock_market.materials_prices[sold_block.export_mat] -= round((sale_value) * (sold_block.quantity / (sold_block.quantity + SSstock_market.materials_quantity[sold_block.export_mat])))
+	SSstock_market.materials_prices[sold_block.export_mat] -= round((SSstock_market.materials_prices[sold_block.export_mat]) * (sold_block.quantity / SSstock_market.materials_quantity[sold_block.export_mat]))
 	SSstock_market.materials_prices[sold_block.export_mat] = round(clamp(SSstock_market.materials_prices[sold_block.export_mat], initial(sold_block.export_mat.value_per_unit) * SHEET_MATERIAL_AMOUNT * 0.5 , initial(sold_block.export_mat.value_per_unit) * SHEET_MATERIAL_AMOUNT * 3))