diff --git a/lib/CodeGen/Mangle.cpp b/lib/CodeGen/Mangle.cpp
index a5b3452..11bbaae 100644
--- a/lib/CodeGen/Mangle.cpp
+++ b/lib/CodeGen/Mangle.cpp
@@ -1015,6 +1015,11 @@
 	//              ::= <expr-primary>
   switch (E->getStmtClass()) {
   default: assert(false && "Unhandled expression kind!");
+
+  case Expr::ParenExprClass:
+    mangleExpression(cast<ParenExpr>(E)->getSubExpr());
+    break;
+
   case Expr::DeclRefExprClass: {
     const Decl *D = cast<DeclRefExpr>(E)->getDecl();
     
diff --git a/test/CodeGenCXX/mangle.cpp b/test/CodeGenCXX/mangle.cpp
index 2ffbae7..03e405e 100644
--- a/test/CodeGenCXX/mangle.cpp
+++ b/test/CodeGenCXX/mangle.cpp
@@ -221,3 +221,9 @@
 // CHECK: @"_ZN2S73$_0C1Ev"
 S7::S7() {}
 
+// PR5063
+template<typename T> typename __enable_if<(__is_scalar<T>::__value), void>::__type ft8() { }
+// CHECK: @_Z3ft8IiEN11__enable_ifIXsr11__is_scalarIT_E7__valueEvE6__typeEv
+template void ft8<int>();
+// CHECK: @_Z3ft8IPvEN11__enable_ifIXsr11__is_scalarIT_E7__valueEvE6__typeEv
+template void ft8<void*>();