diff --git a/pkg/vm/vm.go b/pkg/vm/vm.go
index 604348baf..1f9fa66df 100644
--- a/pkg/vm/vm.go
+++ b/pkg/vm/vm.go
@@ -8,6 +8,11 @@ import (
 
 // VM represents an instance of a Neo Virtual Machine
 type VM struct {
+	// ResultStack contains the results of
+	// the last evaluation stack before the program terminated
+	ResultStack stack.RandomAccess
+	// InvocationStack contains all of the contexts
+	// loaded into the vm
 	InvocationStack stack.Invocation
 	state           Vmstate
 }
@@ -63,5 +68,5 @@ func (v *VM) executeOp(op stack.Instruction, ctx *stack.Context) (Vmstate, error
 	if !ok {
 		return FAULT, fmt.Errorf("unknown opcode entered %v", op)
 	}
-	return handleOp(op, ctx, &v.InvocationStack)
+	return handleOp(op, ctx, &v.InvocationStack, &v.ResultStack)
 }
diff --git a/pkg/vm/vm_ops.go b/pkg/vm/vm_ops.go
index bf9291933..39b796389 100644
--- a/pkg/vm/vm_ops.go
+++ b/pkg/vm/vm_ops.go
@@ -2,7 +2,9 @@ package vm
 
 import "github.com/CityOfZion/neo-go/pkg/vm/stack"
 
-var opFunc = map[stack.Instruction]func(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation) (Vmstate, error){
+type stackInfo func(op stack.Instruction, ctx *stack.Context, istack *stack.Invocation, rstack *stack.RandomAccess) (Vmstate, error)
+
+var opFunc = map[stack.Instruction]stackInfo{
 	stack.ADD:         Add,
 	stack.SUB:         Sub,
 	stack.PUSHBYTES1:  PushNBytes,