diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -6978,13 +6978,13 @@
       //
       // We care about case 1) where the declarator type should be known, and
       // the identifier should be null.
-      if (!ParmDeclarator.isInvalidType() && !ParmDeclarator.hasName()) {
-        if (Tok.getIdentifierInfo() &&
-            Tok.getIdentifierInfo()->isKeyword(getLangOpts())) {
-          Diag(Tok, diag::err_keyword_as_parameter) << PP.getSpelling(Tok);
-          // Consume the keyword.
-          ConsumeToken();
-        }
+      if (!ParmDeclarator.isInvalidType() && !ParmDeclarator.hasName() &&
+          Tok.isNot(tok::raw_identifier) && !Tok.isAnnotation() &&
+          Tok.getIdentifierInfo() &&
+          Tok.getIdentifierInfo()->isKeyword(getLangOpts())) {
+        Diag(Tok, diag::err_keyword_as_parameter) << PP.getSpelling(Tok);
+        // Consume the keyword.
+        ConsumeToken();
       }
       // Inform the actions module about the parameter declarator, so it gets
       // added to the current scope.
diff --git a/clang/test/Parser/cxx-decltype-parameter.cpp b/clang/test/Parser/cxx-decltype-parameter.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/Parser/cxx-decltype-parameter.cpp
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+struct Bar {};
+struct Foo {
+  Bar bar(*decltype(Bar{}) aux); // expected-error {{C++ requires a type specifier for all declarations}}. \
+                                 // expected-error {{expected ')'}} expected-note {{to match this '('}}
+};