diff --git a/clang/lib/Format/ContinuationIndenter.cpp b/clang/lib/Format/ContinuationIndenter.cpp
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -1172,8 +1172,12 @@
   }
   if (NextNonComment->is(TT_TemplateString) && NextNonComment->closesScope())
     return State.Stack[State.Stack.size() - 2].LastSpace;
+  // Field labels in a nested type should be aligned to the brace. For example
+  // in ProtoBuf:
+  //   optional int32 b = 2 [(foo_options) = {aaaaaaaaaaaaaaaaaaa: 123,
+  //                                          bbbbbbbbbbbbbbbbbbbbbbbb:"baz"}];
   if (Current.is(tok::identifier) && Current.Next &&
-      (Current.Next->is(TT_DictLiteral) ||
+      ((Current.Next->is(tok::colon) && Current.Next->is(TT_DictLiteral)) ||
        ((Style.Language == FormatStyle::LK_Proto ||
          Style.Language == FormatStyle::LK_TextProto) &&
         Current.Next->isOneOf(tok::less, tok::l_brace)))) {
diff --git a/clang/unittests/Format/FormatTestVerilog.cpp b/clang/unittests/Format/FormatTestVerilog.cpp
--- a/clang/unittests/Format/FormatTestVerilog.cpp
+++ b/clang/unittests/Format/FormatTestVerilog.cpp
@@ -1172,6 +1172,15 @@
   verifyFormat("c = '{a : 0, b : 0.0, default : 0};", Style);
   verifyFormat("c = ab'{a : 0, b : 0.0};", Style);
   verifyFormat("c = ab'{cd : cd'{1, 1.0}, ef : ef'{2, 2.0}};", Style);
+
+  // It should be indented correctly when the line has to break.
+  verifyFormat("c = //\n"
+               "    '{default: 0};");
+  Style = getDefaultStyle();
+  Style.ContinuationIndentWidth = 2;
+  verifyFormat("c = //\n"
+               "  '{default: 0};",
+               Style);
 }
 
 TEST_F(FormatTestVerilog, StructuredProcedure) {