diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/StackOnlySection.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/StackOnlySection.java
index 07ceedaa87..d6f5aee27a 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/StackOnlySection.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/StackOnlySection.java
@@ -19,7 +19,7 @@
 
 public class StackOnlySection extends TraceSection {
   public StackOnlySection(Hub hub) {
-    super(hub, (short) (hub.opCode().getData().stackSettings().twoLineInstruction() ? 2 : 1));
+    super(hub, (short) (hub.opCode().getData().numberOfStackRows()));
 
     this.addStack(hub);
   }
diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/TraceSection.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/TraceSection.java
index ee180b48c6..5d39d66563 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/TraceSection.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/module/hub/section/TraceSection.java
@@ -161,7 +161,7 @@ private List<TraceFragment> makeStackFragments(final Hub hub, CallFrame f) {
     final List<TraceFragment> r = new ArrayList<>(2);
     Stack snapshot = f.stack().snapshot();
     if (f.pending().lines().isEmpty()) {
-      for (int i = 0; i < (f.opCodeData().stackSettings().twoLineInstruction() ? 2 : 1); i++) {
+      for (int i = 0; i < (f.opCodeData().numberOfStackRows()); i++) {
         r.add(
             StackFragment.prepare(
                 hub,
diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCode.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCode.java
index c1a5f34ac8..0c247a3c52 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCode.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCode.java
@@ -259,7 +259,7 @@ public boolean isAnyOf(OpCode... opCodes) {
   }
 
   public short numberOfStackRows() {
-    return (short) (this.getData().stackSettings().twoLineInstruction() ? 2 : 1);
+    return (short) (this.getData().numberOfStackRows());
   }
 
   public boolean mayTriggerStackUnderflow() {
diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCodeData.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCodeData.java
index f098c1baa1..a845f42783 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCodeData.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/opcode/OpCodeData.java
@@ -109,4 +109,8 @@ public boolean isInvalid() {
   public boolean isMxp() {
     return this.billing().type() != MxpType.NONE;
   }
+
+  public int numberOfStackRows() {
+    return stackSettings.twoLineInstruction() ? 2 : 1;
+  }
 }
diff --git a/arithmetization/src/main/java/net/consensys/linea/zktracer/runtime/stack/Stack.java b/arithmetization/src/main/java/net/consensys/linea/zktracer/runtime/stack/Stack.java
index c587df290d..0a59f7a165 100644
--- a/arithmetization/src/main/java/net/consensys/linea/zktracer/runtime/stack/Stack.java
+++ b/arithmetization/src/main/java/net/consensys/linea/zktracer/runtime/stack/Stack.java
@@ -375,13 +375,13 @@ public void processInstruction(final Hub hub, MessageFrame frame, int stackStamp
     currentOpcodeData = hub.opCodeData();
     callFrame.pending(new StackContext(currentOpcodeData.mnemonic()));
 
-    final int alpha = currentOpcodeData.stackSettings().alpha();
-    final int delta = currentOpcodeData.stackSettings().delta();
+    final short delta = (short) currentOpcodeData.stackSettings().delta();
+    final short alpha = (short) currentOpcodeData.stackSettings().alpha();
 
     Preconditions.checkArgument(heightNew == frame.stackSize());
     height = (short) frame.stackSize();
-    heightNew += currentOpcodeData.stackSettings().nbAdded();
-    heightNew -= currentOpcodeData.stackSettings().nbRemoved();
+    heightNew -= delta;
+    heightNew += alpha;
 
     if (frame.stackSize() < delta) { // Testing for underflow
       status = Status.UNDERFLOW;
@@ -411,12 +411,8 @@ public void processInstruction(final Hub hub, MessageFrame frame, int stackStamp
 
     if (status.isFailure()) {
       heightNew = 0;
-
-      if (currentOpcodeData.stackSettings().twoLineInstruction()) {
-        stamp += callFrame.pending().addEmptyLines(2);
-      } else {
-        stamp += callFrame.pending().addEmptyLines(1);
-      }
+      final int numberOfStackRows = currentOpcodeData.numberOfStackRows();
+      callFrame.pending().addEmptyLines(numberOfStackRows);
 
       return;
     }