diff --git a/llvm/include/llvm/DebugInfo.h b/llvm/include/llvm/DebugInfo.h
index 8486b1023419..ad0149476a17 100644
--- a/llvm/include/llvm/DebugInfo.h
+++ b/llvm/include/llvm/DebugInfo.h
@@ -226,24 +226,27 @@ template <typename T> class DIRef {
   explicit DIRef(const Value *V);
 
 public:
-  T resolve(const DITypeIdentifierMap &Map) const {
-    if (!Val)
-      return T();
-
-    if (const MDNode *MD = dyn_cast<MDNode>(Val))
-      return T(MD);
-
-    const MDString *MS = cast<MDString>(Val);
-    // Find the corresponding MDNode.
-    DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
-    assert(Iter != Map.end() && "Identifier not in the type map?");
-    assert(DIDescriptor(Iter->second).isType() &&
-           "MDNode in DITypeIdentifierMap should be a DIType.");
-    return T(Iter->second);
-  }
+  T resolve(const DITypeIdentifierMap &Map) const;
   operator Value *() const { return const_cast<Value *>(Val); }
 };
 
+template <typename T>
+T DIRef<T>::resolve(const DITypeIdentifierMap &Map) const {
+  if (!Val)
+    return T();
+
+  if (const MDNode *MD = dyn_cast<MDNode>(Val))
+    return T(MD);
+
+  const MDString *MS = cast<MDString>(Val);
+  // Find the corresponding MDNode.
+  DITypeIdentifierMap::const_iterator Iter = Map.find(MS);
+  assert(Iter != Map.end() && "Identifier not in the type map?");
+  assert(DIDescriptor(Iter->second).isType() &&
+         "MDNode in DITypeIdentifierMap should be a DIType.");
+  return T(Iter->second);
+}
+
 /// Specialize getFieldAs to handle fields that are references to DIScopes.
 template <> DIScopeRef DIDescriptor::getFieldAs<DIScopeRef>(unsigned Elt) const;
 /// Specialize DIRef constructor for DIScopeRef.