diff --git a/src/main/java/com/powsybl/openloadflow/network/impl/LfLoadImpl.java b/src/main/java/com/powsybl/openloadflow/network/impl/LfLoadImpl.java
index 659e3744d9..1b23c8e208 100644
--- a/src/main/java/com/powsybl/openloadflow/network/impl/LfLoadImpl.java
+++ b/src/main/java/com/powsybl/openloadflow/network/impl/LfLoadImpl.java
@@ -96,8 +96,9 @@ void updateState(double diffLoadTargetP, boolean loadPowerFactorConstant) {
         init();
         for (int i = 0; i < loadsRefs.size(); i++) {
             Load load = loadsRefs.get(i).get();
-            double updatedP0 = (load.getP0() / PerUnit.SB + diffLoadTargetP * participationFactors[i]) * PerUnit.SB;
-            double updatedQ0 = loadPowerFactorConstant ? getPowerFactor(load) * updatedP0 : load.getQ0();
+            double diffP0 = diffLoadTargetP * participationFactors[i] * PerUnit.SB;
+            double updatedP0 = load.getP0() + diffP0;
+            double updatedQ0 = load.getQ0() + (loadPowerFactorConstant ? getPowerFactor(load) * diffP0 : 0.0);
             load.getTerminal().setP(updatedP0);
             load.getTerminal().setQ(updatedQ0);
         }
diff --git a/src/test/java/com/powsybl/openloadflow/ac/AcLoadFlowTwoBusNetworkTest.java b/src/test/java/com/powsybl/openloadflow/ac/AcLoadFlowTwoBusNetworkTest.java
index fd4a9f21af..1c7b3e24a1 100644
--- a/src/test/java/com/powsybl/openloadflow/ac/AcLoadFlowTwoBusNetworkTest.java
+++ b/src/test/java/com/powsybl/openloadflow/ac/AcLoadFlowTwoBusNetworkTest.java
@@ -6,9 +6,7 @@
  */
 package com.powsybl.openloadflow.ac;
 
-import com.powsybl.iidm.network.Bus;
-import com.powsybl.iidm.network.Line;
-import com.powsybl.iidm.network.Network;
+import com.powsybl.iidm.network.*;
 import com.powsybl.iidm.network.extensions.ActivePowerControlAdder;
 import com.powsybl.loadflow.LoadFlow;
 import com.powsybl.loadflow.LoadFlowParameters;
@@ -162,4 +160,37 @@ void zeroImpedanceToShuntCompensator() {
         assertReactivePowerEquals(0.9038788263615884, network.getLine("l23").getTerminal1());
         assertActivePowerEquals(0.0, network.getLine("l23").getTerminal1());
     }
+
+    @Test
+    void modifiedLoadCaseTest() {
+        // previous value : l1 (P0, Q0) = (2, 1)
+        // new values :     l1 (P0, Q0) = (0, 1) and
+        //                  l2 (P0, Q0) = (2, 0)
+        network.getLoad("l1").setP0(0);
+        Load l2 = bus2.getVoltageLevel().newLoad()
+                .setId("l2")
+                .setBus("b2")
+                .setConnectableBus("b2")
+                .setP0(2)
+                .setQ0(0)
+                .add();
+        l2.getTerminal().setP(2).setQ(0);
+
+        parameters = new LoadFlowParameters()
+                .setReadSlackBus(false)
+                .setDistributedSlack(true)
+                .setBalanceType(LoadFlowParameters.BalanceType.PROPORTIONAL_TO_LOAD);
+        OpenLoadFlowParameters.create(parameters)
+                .setSlackBusSelectionMode(SlackBusSelectionMode.MOST_MESHED)
+                .setLoadPowerFactorConstant(true);
+
+        LoadFlowResult result = loadFlowRunner.run(network, parameters);
+        assertTrue(result.isOk());
+
+        Double bus2BalanceQ = bus2.getConnectedTerminalStream().map(Terminal::getQ)
+                .filter(d -> !Double.isNaN(d))
+                .reduce(0.0, Double::sum);
+
+        assertEquals(0.0, bus2BalanceQ, DELTA_POWER);
+    }
 }