diff --git a/x/feemarket/ante/fee.go b/x/feemarket/ante/fee.go
index 7bbbf82..2179281 100644
--- a/x/feemarket/ante/fee.go
+++ b/x/feemarket/ante/fee.go
@@ -114,6 +114,8 @@ func (dfd feeMarketCheckDecorator) anteHandle(ctx sdk.Context, tx sdk.Tx, simula
 	payCoin := sdk.NewCoin(params.FeeDenom, sdkmath.ZeroInt())
 	if !simulate {
 		payCoin = feeCoins[0]
+	} else if len(feeCoins) == 1 { // case where a denom was specified for this simulation
+		payCoin.Denom = feeCoins[0].Denom
 	}
 
 	feeGas := int64(feeTx.GetGas())
diff --git a/x/feemarket/post/fee.go b/x/feemarket/post/fee.go
index fd652dd..b99950c 100644
--- a/x/feemarket/post/fee.go
+++ b/x/feemarket/post/fee.go
@@ -96,6 +96,9 @@ func (dfd FeeMarketDeductDecorator) PostHandle(ctx sdk.Context, tx sdk.Tx, simul
 	)
 	if !simulate {
 		payCoin = feeCoins[0]
+	} else if len(feeCoins) == 1 { // case where a denom was specified for this simulation
+		payCoin.Denom = feeCoins[0].Denom
+		tip.Denom = feeCoins[0].Denom
 	}
 
 	feeGas := int64(feeTx.GetGas())