diff --git a/src/commonMain/kotlin/exchange.dydx.abacus/calculator/TradeInputCalculator.kt b/src/commonMain/kotlin/exchange.dydx.abacus/calculator/TradeInputCalculator.kt
index 6067ae2d5..480d9a85b 100644
--- a/src/commonMain/kotlin/exchange.dydx.abacus/calculator/TradeInputCalculator.kt
+++ b/src/commonMain/kotlin/exchange.dydx.abacus/calculator/TradeInputCalculator.kt
@@ -1217,7 +1217,7 @@ internal class TradeInputCalculator(
             return parser.asDouble(parser.value(position, "maxLeverage.current"))
         } else {
             val initialMarginFraction =
-                parser.asDouble(parser.value(market, "configs.initialMarginFraction"))
+                parser.asDouble(parser.value(market, "configs.effectiveInitialMarginFraction"))
                     ?: return null
             return 1.0 / initialMarginFraction
         }