diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/BrkInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/BrkInstruction.java
index cf2e92f..e0c4ed0 100755
--- a/Server/src/main/java/net/simon987/server/assembly/instruction/BrkInstruction.java
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/BrkInstruction.java
@@ -9,8 +9,10 @@ import net.simon987.server.assembly.Status;
  */
 public class BrkInstruction extends Instruction {
 
+    public static final int OPCODE = 0;
+
     public BrkInstruction() {
-        super("brk", 0);
+        super("brk", OPCODE);
     }
 
     @Override
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/DecInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/DecInstruction.java
index 29a3ddb..d04cd59 100644
--- a/Server/src/main/java/net/simon987/server/assembly/instruction/DecInstruction.java
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/DecInstruction.java
@@ -7,7 +7,7 @@ import net.simon987.server.assembly.Util;
 
 public class DecInstruction extends Instruction {
 
-    public static final int OPCODE = 0x2B;
+    public static final int OPCODE = 43;
 
     public DecInstruction() {
         super("dec", OPCODE);
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/IncInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/IncInstruction.java
index 05c5fa4..23a5403 100644
--- a/Server/src/main/java/net/simon987/server/assembly/instruction/IncInstruction.java
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/IncInstruction.java
@@ -7,7 +7,7 @@ import net.simon987.server.assembly.Util;
 
 public class IncInstruction extends Instruction {
 
-    public static final int OPCODE = 0x2A;
+    public static final int OPCODE = 42;
 
     public IncInstruction() {
         super("inc", OPCODE);
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/NopInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/NopInstruction.java
index a0c8b95..be687bd 100755
--- a/Server/src/main/java/net/simon987/server/assembly/instruction/NopInstruction.java
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/NopInstruction.java
@@ -8,7 +8,9 @@ import net.simon987.server.assembly.Instruction;
  */
 public class NopInstruction extends Instruction {
 
+    public static final int OPCODE = 63;
+
     public NopInstruction() {
-        super("nop", 63);
+        super("nop", OPCODE);
     }
 }