Index: lib/AST/DeclPrinter.cpp
===================================================================
--- lib/AST/DeclPrinter.cpp	(revision 173620)
+++ lib/AST/DeclPrinter.cpp	(working copy)
@@ -646,9 +646,13 @@
   Expr *Init = D->getInit();
   if (!Policy.SuppressInitializers && Init) {
     bool ImplicitInit = false;
-    if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init))
-      ImplicitInit = D->getInitStyle() == VarDecl::CallInit &&
-          Construct->getNumArgs() == 0 && !Construct->isListInitialization();
+    if (CXXConstructExpr *Construct = dyn_cast<CXXConstructExpr>(Init)) {
+      if (D->getInitStyle() == VarDecl::CallInit &&
+          !Construct->isListInitialization()) {
+        ImplicitInit = Construct->getNumArgs() == 0 ||
+          Construct->getArg(0)->isDefaultArgument();
+      }
+    }
     if (!ImplicitInit) {
       if ((D->getInitStyle() == VarDecl::CallInit) && !isa<ParenListExpr>(Init))
         Out << "(";
Index: test/SemaCXX/ast-print.cpp
===================================================================
--- test/SemaCXX/ast-print.cpp	(revision 173620)
+++ test/SemaCXX/ast-print.cpp	(working copy)
@@ -99,3 +99,16 @@
   return test10::M::X<INT>::value;
 }
 
+
+struct DefaultArgClass
+{
+  DefaultArgClass(int a = 1) {}
+};
+
+// CHECK: test12
+// CHECK-NEXT: DefaultArgClass useDefaultArg;
+// CHECK-NEXT: DefaultArgClass overrideDefaultArg(1);
+void test12() {
+  DefaultArgClass useDefaultArg;
+  DefaultArgClass overrideDefaultArg(1);
+}