diff --git a/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java b/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java
index 80627ff..3cf201c 100644
--- a/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java
+++ b/src/de/inetsoftware/jwebassembly/binary/BinaryModuleWriter.java
@@ -1276,7 +1276,7 @@ public class BinaryModuleWriter extends ModuleWriter implements InstructionOpcod
             case SET:
                 opCode = ARRAY_SET;
                 break;
-            case LENGTH:
+            case LEN:
                 opCode = ARRAY_LEN;
                 break;
             default:
diff --git a/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java b/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java
index 498f153..5bafd34 100644
--- a/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java
+++ b/src/de/inetsoftware/jwebassembly/module/JavaMethodWasmCodeBuilder.java
@@ -643,7 +643,7 @@ class JavaMethodWasmCodeBuilder extends WasmCodeBuilder {
                         addArrayInstruction( ArrayOperator.NEW, type, codePos, lineNumber );
                         break;
                     case 190: // arraylength
-                        addArrayInstruction( ArrayOperator.LENGTH, ValueType.i32, codePos, lineNumber );
+                        addArrayInstruction( ArrayOperator.LEN, ValueType.i32, codePos, lineNumber );
                         break;
                     case 191: // athrow
                         addBlockInstruction( WasmBlockOperator.THROW, null, codePos, lineNumber );
diff --git a/src/de/inetsoftware/jwebassembly/module/WasmArrayInstruction.java b/src/de/inetsoftware/jwebassembly/module/WasmArrayInstruction.java
index a0f06cf..5b6fc1a 100644
--- a/src/de/inetsoftware/jwebassembly/module/WasmArrayInstruction.java
+++ b/src/de/inetsoftware/jwebassembly/module/WasmArrayInstruction.java
@@ -82,7 +82,7 @@ class WasmArrayInstruction extends WasmInstruction {
                 return type instanceof ValueType ? (ValueType)type : ValueType.anyref;
             case SET:
                 return null;
-            case LENGTH:
+            case LEN:
                 return ValueType.i32;
             default:
                 throw new WasmException( "Unknown array operation: " + op, -1 );
@@ -98,7 +98,7 @@ class WasmArrayInstruction extends WasmInstruction {
             case NEW:
             case GET:
                 return 2;
-            case LENGTH:
+            case LEN:
                 return 1;
             case SET:
                 return 3;
diff --git a/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java b/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java
index de5ff64..c352c74 100644
--- a/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java
+++ b/src/de/inetsoftware/jwebassembly/text/TextModuleWriter.java
@@ -762,7 +762,7 @@ public class TextModuleWriter extends ModuleWriter {
             case SET:
                 operation = "set";
                 break;
-            case LENGTH:
+            case LEN:
                 operation = "len";
                 break;
             default:
diff --git a/src/de/inetsoftware/jwebassembly/wasm/ArrayOperator.java b/src/de/inetsoftware/jwebassembly/wasm/ArrayOperator.java
index 7766125..39718d5 100644
--- a/src/de/inetsoftware/jwebassembly/wasm/ArrayOperator.java
+++ b/src/de/inetsoftware/jwebassembly/wasm/ArrayOperator.java
@@ -1,5 +1,5 @@
 /*
-   Copyright 2018 Volker Berlin (i-net software)
+   Copyright 2018 - 2019 Volker Berlin (i-net software)
 
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
@@ -25,5 +25,5 @@ public enum ArrayOperator {
     NEW,
     GET,
     SET,
-    LENGTH,
+    LEN,
 }
\ No newline at end of file