diff --git a/src/de/inetsoftware/classparser/MethodInfo.java b/src/de/inetsoftware/classparser/MethodInfo.java
index e95dc50..51910f9 100644
--- a/src/de/inetsoftware/classparser/MethodInfo.java
+++ b/src/de/inetsoftware/classparser/MethodInfo.java
@@ -1,5 +1,5 @@
 /*
-   Copyright 2011 - 2020 Volker Berlin (i-net software)
+   Copyright 2011 - 2021 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.
@@ -110,6 +110,15 @@ public class MethodInfo implements Member {
         return (accessFlags & 0x0400) > 0;
     }
 
+    /**
+     * If the method is synthetic
+     * 
+     * @return true, if synthetic
+     */
+    public boolean isSynthetic() {
+        return (accessFlags & 0x1000) > 0;
+    }
+
     /**
      * @return the name
      */
diff --git a/src/de/inetsoftware/jwebassembly/module/ModuleGenerator.java b/src/de/inetsoftware/jwebassembly/module/ModuleGenerator.java
index e52e6fd..4966a7a 100644
--- a/src/de/inetsoftware/jwebassembly/module/ModuleGenerator.java
+++ b/src/de/inetsoftware/jwebassembly/module/ModuleGenerator.java
@@ -222,7 +222,9 @@ public class ModuleGenerator {
             }
             if( method != null ) {
                 createInstructions( functions.replace( next, method ) );
-                boolean needThisParameter = !method.isStatic() || "<init>".equals( method.getName() );
+                boolean needThisParameter = !method.isStatic()                                         // if not static there is a not declared THIS parameter
+                                || "<init>".equals( method.getName() )                                 // constructor method need also the THIS parameter also if marked as static
+                                || (method.isSynthetic() && method.getName().startsWith( "lambda$" )); // lambda functions are static but will call with a THIS parameter which need be removed from stack
                 functions.markAsScanned( next, needThisParameter );
                 if( needThisParameter ) {
                     types.valueOf( next.className ); // for the case that the type unknown yet