diff --git a/docs/tutorial/LangImpl5.html b/docs/tutorial/LangImpl5.html
index bb4b407..f3630d0 100644
--- a/docs/tutorial/LangImpl5.html
+++ b/docs/tutorial/LangImpl5.html
@@ -856,7 +856,7 @@
     NamedValues.erase(VarName);
   
   // for expr always returns 0.0.
-  return Constant::getNullValue(Type::DoubleTy);
+  return TheFunction->getContext()->getNullValue(Type::DoubleTy);
 }
 </pre>
 </div>
diff --git a/docs/tutorial/LangImpl6.html b/docs/tutorial/LangImpl6.html
index c6d9ce1..c0c396b 100644
--- a/docs/tutorial/LangImpl6.html
+++ b/docs/tutorial/LangImpl6.html
@@ -1570,7 +1570,7 @@
 
   
   // for expr always returns 0.0.
-  return Constant::getNullValue(Type::DoubleTy);
+  return TheFunction->getContext()->getNullValue(Type::DoubleTy);
 }
 
 Function *PrototypeAST::Codegen() {
diff --git a/docs/tutorial/LangImpl7.html b/docs/tutorial/LangImpl7.html
index 71bb397..157b7dd 100644
--- a/docs/tutorial/LangImpl7.html
+++ b/docs/tutorial/LangImpl7.html
@@ -1858,7 +1858,7 @@
 
   
   // for expr always returns 0.0.
-  return Constant::getNullValue(Type::DoubleTy);
+  return TheFunction->getContext()->getNullValue(Type::DoubleTy);
 }
 
 Value *VarExprAST::Codegen() {