diff --git a/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcActivePowerDistributionOuterLoop.java b/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcActivePowerDistributionOuterLoop.java
index 8e602ceed4..43abbd88a7 100644
--- a/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcActivePowerDistributionOuterLoop.java
+++ b/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcActivePowerDistributionOuterLoop.java
@@ -19,8 +19,4 @@
  * @author Valentin Mouradian {@literal <valentin.mouradian at artelys.com>}
  */
 public interface AcActivePowerDistributionOuterLoop extends ActivePowerDistributionOuterLoop<AcVariableType, AcEquationType, AcLoadFlowParameters, AcLoadFlowContext, AcOuterLoopContext> {
-    @Override
-    default double getSlackBusActivePowerMismatch(AcOuterLoopContext context) {
-        return context.getLastSolverResult().getSlackBusActivePowerMismatch();
-    }
 }
diff --git a/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcAreaInterchangeControlOuterLoop.java b/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcAreaInterchangeControlOuterLoop.java
index 7e2c533173..3b466535eb 100644
--- a/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcAreaInterchangeControlOuterLoop.java
+++ b/src/main/java/com/powsybl/openloadflow/ac/outerloop/AcAreaInterchangeControlOuterLoop.java
@@ -37,4 +37,9 @@ public String getName() {
         return NAME;
     }
 
+    @Override
+    public double getSlackBusActivePowerMismatch(AcOuterLoopContext context) {
+        return context.getLastSolverResult().getSlackBusActivePowerMismatch();
+    }
+
 }
diff --git a/src/main/java/com/powsybl/openloadflow/ac/outerloop/DistributedSlackOuterLoop.java b/src/main/java/com/powsybl/openloadflow/ac/outerloop/DistributedSlackOuterLoop.java
index 67c1d57b43..997ef7d3d3 100644
--- a/src/main/java/com/powsybl/openloadflow/ac/outerloop/DistributedSlackOuterLoop.java
+++ b/src/main/java/com/powsybl/openloadflow/ac/outerloop/DistributedSlackOuterLoop.java
@@ -93,6 +93,11 @@ public OuterLoopResult check(AcOuterLoopContext context, ReportNode reportNode)
         }
     }
 
+    @Override
+    public double getSlackBusActivePowerMismatch(AcOuterLoopContext context) {
+        return context.getLastSolverResult().getSlackBusActivePowerMismatch();
+    }
+
     @Override
     public OpenLoadFlowParameters.SlackDistributionFailureBehavior getSlackDistributionFailureBehavior(AcOuterLoopContext context) {
         OpenLoadFlowParameters.SlackDistributionFailureBehavior slackDistributionFailureBehavior = context.getLoadFlowContext().getParameters().getSlackDistributionFailureBehavior();