diff --git a/lib/Sema/SemaExprCXX.cpp b/lib/Sema/SemaExprCXX.cpp
index 16d9ae9..0db8cd4 100644
--- a/lib/Sema/SemaExprCXX.cpp
+++ b/lib/Sema/SemaExprCXX.cpp
@@ -2057,18 +2057,22 @@
   switch (Kind) {
   default: llvm_unreachable("Unhandled cast kind!");
   case CK_ConstructorConversion: {
+    CXXConstructorDecl *Constructor = cast<CXXConstructorDecl>(Method);
     ASTOwningVector<Expr*> ConstructorArgs(S);
 
-    if (S.CompleteConstructorCall(cast<CXXConstructorDecl>(Method),
+    if (S.CompleteConstructorCall(Constructor,
                                   MultiExprArg(&From, 1),
                                   CastLoc, ConstructorArgs))
       return ExprError();
 
-    ExprResult Result =
-    S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
-                            move_arg(ConstructorArgs), HadMultipleCandidates,
-                            /*ZeroInit*/ false, CXXConstructExpr::CK_Complete,
-                            SourceRange());
+    S.CheckConstructorAccess(CastLoc, Constructor, Constructor->getAccess(),
+                             S.PDiag(diag::err_access_ctor));
+    
+    ExprResult Result
+      = S.BuildCXXConstructExpr(CastLoc, Ty, cast<CXXConstructorDecl>(Method),
+                                move_arg(ConstructorArgs), 
+                                HadMultipleCandidates, /*ZeroInit*/ false, 
+                                CXXConstructExpr::CK_Complete, SourceRange());
     if (Result.isInvalid())
       return ExprError();
 
diff --git a/test/CodeGenCXX/constructor-convert.cpp b/test/CodeGenCXX/constructor-convert.cpp
index 9122dae..7feeaa9 100644
--- a/test/CodeGenCXX/constructor-convert.cpp
+++ b/test/CodeGenCXX/constructor-convert.cpp
@@ -2,6 +2,7 @@
 
 // PR5775
 class Twine {
+public:
   Twine(const char *Str) { }
 };
 
diff --git a/test/SemaCXX/user-defined-conversions.cpp b/test/SemaCXX/user-defined-conversions.cpp
index 5de7f44..43ec5a3 100644
--- a/test/SemaCXX/user-defined-conversions.cpp
+++ b/test/SemaCXX/user-defined-conversions.cpp
@@ -82,3 +82,18 @@
 void g(X2 b) {
   int &ir = f(b); // expected-error{{no viable constructor copying parameter of type 'X1'}}
 }
+
+namespace rdar10202900 {
+  class A {
+  public:
+    A();
+
+  private:
+    A(int i); // expected-note{{declared private here}}
+  };
+
+  void testA(A a) {
+    int b = 10;
+    a = b; // expected-error{{calling a private constructor of class 'rdar10202900::A'}}
+  }
+}