diff --git a/lib/nodes.js b/lib/nodes.js
index ecd2c718..c82f3035 100644
--- a/lib/nodes.js
+++ b/lib/nodes.js
@@ -1065,7 +1065,7 @@
               if (!assign.variable["this"]) {
                 assign.variable = new Value(new Literal(name), [new Access(base, 'proto')]);
               }
-              if (func instanceof Code && func.bound) {
+              if (func instanceof Code && func.bound && !assign.variable["this"]) {
                 this.boundFuncs.push(base);
                 func.bound = false;
               }
diff --git a/src/nodes.coffee b/src/nodes.coffee
index c40890ad..58c800d7 100644
--- a/src/nodes.coffee
+++ b/src/nodes.coffee
@@ -858,7 +858,7 @@ exports.Class = class Class extends Base
         else
           unless assign.variable.this
             assign.variable = new Value(new Literal(name), [new Access(base, 'proto')])
-          if func instanceof Code and func.bound
+          if func instanceof Code and func.bound and not assign.variable.this
             @boundFuncs.push base
             func.bound = no
       assign