diff --git a/ast.h b/ast.h
index 56f9e75..88562cd 100644
--- a/ast.h
+++ b/ast.h
@@ -38,6 +38,7 @@
 #define _H_ast
 
 #include <stdlib.h>   // for NULL
+#include "irgen.h"
 #include "location.h"
 #include <iostream>
 
@@ -68,7 +69,7 @@ class Node  {
     void Print(int indentLevel, const char *label = NULL); 
     virtual void PrintChildren(int indentLevel)  {}
 
-    virtual void Emit() {}
+    virtual llvm::Value* Emit() { return NULL; }
 };
    
 
diff --git a/ast_stmt.cc b/ast_stmt.cc
index 81dd227..2c37830 100644
--- a/ast_stmt.cc
+++ b/ast_stmt.cc
@@ -23,7 +23,7 @@ void Program::PrintChildren(int indentLevel) {
     printf("\n");
 }
 
-void Program::Emit() {
+llvm::Value* Program::Emit() {
     // TODO:
     // This is just a reference for you to get started
     //
diff --git a/ast_stmt.h b/ast_stmt.h
index 8d782ac..ff644f1 100644
--- a/ast_stmt.h
+++ b/ast_stmt.h
@@ -32,7 +32,7 @@ class Program : public Node
      Program(List<Decl*> *declList);
      const char *GetPrintNameForNode() { return "Program"; }
      void PrintChildren(int indentLevel);
-     virtual void Emit();
+     virtual llvm::Value* Emit();
 };
 
 class Stmt : public Node