diff --git a/src/main/java/net/consensys/linea/zktracer/module/alu/add/AddTracer.java b/src/main/java/net/consensys/linea/zktracer/module/alu/add/AddTracer.java
index 13ca74fd5e..0bd6d58f84 100644
--- a/src/main/java/net/consensys/linea/zktracer/module/alu/add/AddTracer.java
+++ b/src/main/java/net/consensys/linea/zktracer/module/alu/add/AddTracer.java
@@ -27,12 +27,12 @@
 import org.apache.tuweni.units.bigints.UInt256;
 
 public class AddTracer implements ModuleTracer {
-
+  public static final String ADD_JSON_KEY = "add";
   private int stamp = 0;
 
   @Override
   public String jsonKey() {
-    return "add";
+    return ADD_JSON_KEY;
   }
 
   @Override
diff --git a/src/test/java/net/consensys/linea/zktracer/specs/AddTracerBySpecTest.java b/src/test/java/net/consensys/linea/zktracer/specs/AddTracerBySpecTest.java
index 03f22ea849..1637620a2a 100644
--- a/src/test/java/net/consensys/linea/zktracer/specs/AddTracerBySpecTest.java
+++ b/src/test/java/net/consensys/linea/zktracer/specs/AddTracerBySpecTest.java
@@ -14,20 +14,20 @@
  */
 package net.consensys.linea.zktracer.specs;
 
+import static net.consensys.linea.zktracer.module.alu.add.AddTracer.ADD_JSON_KEY;
+
 import net.consensys.linea.zktracer.AbstractModuleTracerBySpecTest;
 import net.consensys.linea.zktracer.module.ModuleTracer;
 import net.consensys.linea.zktracer.module.alu.add.AddTracer;
 
 public class AddTracerBySpecTest extends AbstractModuleTracerBySpecTest {
 
-  static ModuleTracer tracer = new AddTracer();
-
   public static Object[][] specs() {
-    return findSpecFiles(new String[] {tracer.jsonKey()});
+    return findSpecFiles(new String[] {ADD_JSON_KEY});
   }
 
   @Override
   protected ModuleTracer getModuleTracer() {
-    return tracer;
+    return new AddTracer();
   }
 }