diff --git a/Server/src/main/java/net/simon987/server/assembly/DefaultInstructionSet.java b/Server/src/main/java/net/simon987/server/assembly/DefaultInstructionSet.java
index 723865c..a1bed9b 100755
--- a/Server/src/main/java/net/simon987/server/assembly/DefaultInstructionSet.java
+++ b/Server/src/main/java/net/simon987/server/assembly/DefaultInstructionSet.java
@@ -1,7 +1,6 @@
 package net.simon987.server.assembly;
 
 import net.simon987.server.assembly.instruction.*;
-import net.simon987.server.logging.LogManager;
 
 import java.util.HashMap;
 import java.util.Map;
@@ -107,7 +106,7 @@ public class DefaultInstructionSet implements InstructionSet {
     public void add(Instruction instruction) {
         Instruction aliasedInstruction = instructionMap.get(instruction.getOpCode());
         if (aliasedInstruction != null) {
-            aliasesMap.put(instruction.getMnemonic(), aliasedInstruction);
+            aliasesMap.put(instruction.getMnemonic(), instruction);
         } else {
             instructionMap.put(instruction.getOpCode(), instruction);
         }
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/SalInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/SalInstruction.java
index f24ab94..8d3a405 100644
--- a/Server/src/main/java/net/simon987/server/assembly/instruction/SalInstruction.java
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/SalInstruction.java
@@ -1,13 +1,11 @@
 package net.simon987.server.assembly.instruction;
 
-import net.simon987.server.assembly.Instruction;
-
 /**
  * Alias of SHL instruction
  */
-public class SalInstruction extends Instruction {
+public class SalInstruction extends ShlInstruction {
 
     public SalInstruction() {
-        super("sal", ShlInstruction.OPCODE);
+        super("sal");
     }
 }
diff --git a/Server/src/main/java/net/simon987/server/assembly/instruction/ShlInstruction.java b/Server/src/main/java/net/simon987/server/assembly/instruction/ShlInstruction.java
index 58b356f..2f473f8 100644
--- a/Server/src/main/java/net/simon987/server/assembly/instruction/ShlInstruction.java
+++ b/Server/src/main/java/net/simon987/server/assembly/instruction/ShlInstruction.java
@@ -13,6 +13,10 @@ public class ShlInstruction extends Instruction {
         super("shl", OPCODE);
     }
 
+    public ShlInstruction(String alias) {
+        super(alias, OPCODE);
+    }
+
     @Override
     public Status execute(Target dst, int dstIndex, Target src, int srcIndex, Status status) {