Index: lib/Format/TokenAnnotator.cpp
===================================================================
--- lib/Format/TokenAnnotator.cpp
+++ lib/Format/TokenAnnotator.cpp
@@ -352,6 +352,7 @@
   bool isCpp11AttributeSpecifier(const FormatToken &Tok) {
     if (!Style.isCpp() || !Tok.startsSequence(tok::l_square, tok::l_square))
       return false;
+
     const FormatToken *AttrTok = Tok.Next->Next;
     if (!AttrTok)
       return false;
@@ -366,7 +367,8 @@
       // specifier parameter, although this is technically valid:
       // [[foo(:)]]
       if (AttrTok->is(tok::colon) ||
-          AttrTok->startsSequence(tok::identifier, tok::identifier))
+          AttrTok->startsSequence(tok::identifier, tok::identifier) || 
+          AttrTok->startsSequence(tok::r_paren, tok::identifier))
         return false;
       if (AttrTok->is(tok::ellipsis))
         return true;
@@ -2489,6 +2491,7 @@
                 LSquareTok.endsSequence(tok::l_square, tok::colon,
                                         TT_SelectorName));
       };
+
   if (Left.is(tok::l_square))
     return (Left.is(TT_ArrayInitializerLSquare) && Right.isNot(tok::r_square) &&
             SpaceRequiredForArrayInitializerLSquare(Left, Style)) ||
Index: unittests/Format/FormatTest.cpp
===================================================================
--- unittests/Format/FormatTest.cpp
+++ unittests/Format/FormatTest.cpp
@@ -6472,6 +6472,8 @@
   // Make sure we do not mistake attributes for array subscripts.
   verifyFormat("int a() {}\n"
                "[[unused]] int b() {}\n");
+  verifyFormat("NSArray *arr;\n"
+               "arr[[Foo() bar]];");
 
   // On the other hand, we still need to correctly find array subscripts.
   verifyFormat("int a = std::vector<int>{1, 2, 3}[0];");