diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2246,8 +2246,9 @@
              PreviousNotConst->MatchingParen->Previous->isNot(tok::kw_template);
     }
 
-    if (PreviousNotConst->is(tok::r_paren) &&
-        PreviousNotConst->is(TT_TypeDeclarationParen)) {
+    if ((PreviousNotConst->is(tok::r_paren) &&
+         PreviousNotConst->is(TT_TypeDeclarationParen)) ||
+        PreviousNotConst->is(TT_AttributeRParen)) {
       return true;
     }
 
diff --git a/clang/unittests/Format/FormatTest.cpp b/clang/unittests/Format/FormatTest.cpp
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -16394,8 +16394,10 @@
 
   verifyFormat("int f ();", SpaceFuncDecl);
   verifyFormat("void f(int a, T b) {}", SpaceFuncDecl);
+  verifyFormat("void __attribute__((asdf)) f(int a, T b) {}", SpaceFuncDecl);
   verifyFormat("A::A() : a(1) {}", SpaceFuncDecl);
   verifyFormat("void f () __attribute__((asdf));", SpaceFuncDecl);
+  verifyFormat("void __attribute__((asdf)) f ();", SpaceFuncDecl);
   verifyFormat("#define A(x) x", SpaceFuncDecl);
   verifyFormat("#define A (x) x", SpaceFuncDecl);
   verifyFormat("#if defined(x)\n"
@@ -16429,8 +16431,10 @@
 
   verifyFormat("int f();", SpaceFuncDef);
   verifyFormat("void f (int a, T b) {}", SpaceFuncDef);
+  verifyFormat("void __attribute__((asdf)) f (int a, T b) {}", SpaceFuncDef);
   verifyFormat("A::A() : a(1) {}", SpaceFuncDef);
   verifyFormat("void f() __attribute__((asdf));", SpaceFuncDef);
+  verifyFormat("void __attribute__((asdf)) f();", SpaceFuncDef);
   verifyFormat("#define A(x) x", SpaceFuncDef);
   verifyFormat("#define A (x) x", SpaceFuncDef);
   verifyFormat("#if defined(x)\n"
diff --git a/clang/unittests/Format/TokenAnnotatorTest.cpp b/clang/unittests/Format/TokenAnnotatorTest.cpp
--- a/clang/unittests/Format/TokenAnnotatorTest.cpp
+++ b/clang/unittests/Format/TokenAnnotatorTest.cpp
@@ -2313,6 +2313,7 @@
 TEST_F(TokenAnnotatorTest, UnderstandsAttributes) {
   auto Tokens = annotate("bool foo __attribute__((unused));");
   ASSERT_EQ(Tokens.size(), 10u) << Tokens;
+  EXPECT_TOKEN(Tokens[1], tok::identifier, TT_StartOfName);
   EXPECT_TOKEN(Tokens[3], tok::l_paren, TT_AttributeLParen);
   EXPECT_TOKEN(Tokens[4], tok::l_paren, TT_Unknown);
   EXPECT_TOKEN(Tokens[6], tok::r_paren, TT_Unknown);
@@ -2323,6 +2324,22 @@
   EXPECT_TOKEN(Tokens[3], tok::l_paren, TT_AttributeLParen);
   EXPECT_TOKEN(Tokens[5], tok::r_paren, TT_AttributeRParen);
 
+  Tokens = annotate("bool __attribute__((unused)) foo;");
+  ASSERT_EQ(Tokens.size(), 10u) << Tokens;
+  EXPECT_TOKEN(Tokens[2], tok::l_paren, TT_AttributeLParen);
+  EXPECT_TOKEN(Tokens[3], tok::l_paren, TT_Unknown);
+  EXPECT_TOKEN(Tokens[5], tok::r_paren, TT_Unknown);
+  EXPECT_TOKEN(Tokens[6], tok::r_paren, TT_AttributeRParen);
+  EXPECT_TOKEN(Tokens[7], tok::identifier, TT_StartOfName);
+
+  Tokens = annotate("void __attribute__((x)) Foo();");
+  ASSERT_EQ(Tokens.size(), 12u) << Tokens;
+  EXPECT_TOKEN(Tokens[2], tok::l_paren, TT_AttributeLParen);
+  EXPECT_TOKEN(Tokens[3], tok::l_paren, TT_Unknown);
+  EXPECT_TOKEN(Tokens[5], tok::r_paren, TT_Unknown);
+  EXPECT_TOKEN(Tokens[6], tok::r_paren, TT_AttributeRParen);
+  EXPECT_TOKEN(Tokens[7], tok::identifier, TT_FunctionDeclarationName);
+
   FormatStyle Style = getLLVMStyle();
   Style.AttributeMacros.push_back("FOO");
   Tokens = annotate("bool foo FOO(unused);", Style);