diff --git a/lib/AST/DeclCXX.cpp b/lib/AST/DeclCXX.cpp
index 0c78abb..571ad4b 100644
--- a/lib/AST/DeclCXX.cpp
+++ b/lib/AST/DeclCXX.cpp
@@ -1695,7 +1695,9 @@
   return (getNumParams() == 0 &&
           getType()->getAs<FunctionProtoType>()->isVariadic()) ||
          (getNumParams() == 1) ||
-         (getNumParams() > 1 && getParamDecl(1)->hasDefaultArg());
+         (getNumParams() > 1 &&
+          (getParamDecl(1)->hasDefaultArg() ||
+           getParamDecl(1)->isParameterPack()));
 }
 
 bool CXXConstructorDecl::isSpecializationCopyingObject() const {
diff --git a/test/CXX/special/class.conv/class.conv.ctor/p1.cpp b/test/CXX/special/class.conv/class.conv.ctor/p1.cpp
new file mode 100644
index 0000000..d2add82
--- /dev/null
+++ b/test/CXX/special/class.conv/class.conv.ctor/p1.cpp
@@ -0,0 +1,21 @@
+// RUN: %clang_cc1 -std=c++11 %s -verify 
+
+namespace PR13003 {
+  struct void_type
+  {
+    template <typename Arg0, typename... Args>
+    void_type(Arg0&&, Args&&...) { }
+  };
+
+  struct void_type2
+  {
+    template <typename... Args>
+    void_type2(Args&&...) { }
+  };
+  
+  struct atom { };
+  
+  void_type v1 = atom();
+  void_type2 v2 = atom();
+}
+