diff --git a/include/clang/AST/Type.h b/include/clang/AST/Type.h
index 3176f19..7bd367c 100644
--- a/include/clang/AST/Type.h
+++ b/include/clang/AST/Type.h
@@ -4816,6 +4816,12 @@
   return false;
 }
 
+inline bool Type::isVoidType() const {
+  if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType))
+    return BT->getKind() == BuiltinType::Void;
+  return false;
+}
+
 inline bool Type::isHalfType() const {
   if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType))
     return BT->getKind() == BuiltinType::Half;
diff --git a/lib/AST/Type.cpp b/lib/AST/Type.cpp
index fd8a03f..d9fecd4 100644
--- a/lib/AST/Type.cpp
+++ b/lib/AST/Type.cpp
@@ -309,13 +309,6 @@
   }
 }
 
-/// isVoidType - Helper method to determine if this is the 'void' type.
-bool Type::isVoidType() const {
-  if (const BuiltinType *BT = dyn_cast<BuiltinType>(CanonicalType))
-    return BT->getKind() == BuiltinType::Void;
-  return false;
-}
-
 bool Type::isDerivedType() const {
   switch (CanonicalType->getTypeClass()) {
   case Pointer: