diff --git a/clang/lib/Format/Format.cpp b/clang/lib/Format/Format.cpp
--- a/clang/lib/Format/Format.cpp
+++ b/clang/lib/Format/Format.cpp
@@ -3190,7 +3190,7 @@
       return BracesRemover(Env, Expanded).process();
     });
 
-  if (Style.Language == FormatStyle::LK_Cpp) {
+  if (Style.isCpp()) {
     if (Style.FixNamespaceComments)
       Passes.emplace_back([&](const Environment &Env) {
         return NamespaceEndCommentsFixer(Env, Expanded).process();
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
@@ -23347,7 +23347,7 @@
 }
 
 TEST_F(FormatTest, VeryLongNamespaceCommentSplit) {
-  // These tests are not in NamespaceFixer because that doesn't
+  // These tests are not in NamespaceEndCommentsFixerTest because that doesn't
   // test its interaction with line wrapping
   FormatStyle Style = getLLVMStyleWithColumns(80);
   verifyFormat("namespace {\n"
diff --git a/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp b/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
--- a/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
+++ b/clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp
@@ -416,6 +416,19 @@
                                     "// unrelated"));
 }
 
+TEST_F(NamespaceEndCommentsFixerTest, WorksForObjCpp) {
+  FormatStyle ObjCppStyle = getLLVMStyle();
+  ObjCppStyle.Language = FormatStyle::LK_ObjC;
+  EXPECT_EQ("namespace {\n"
+            "int i;\n"
+            "int j;\n"
+            "}// namespace",
+            fixNamespaceEndComments("namespace {\n"
+                                    "int i;\n"
+                                    "int j;\n"
+                                    "}", ObjCppStyle));
+}
+
 TEST_F(NamespaceEndCommentsFixerTest, AddsMacroEndComment) {
   FormatStyle Style = getLLVMStyle();
   Style.NamespaceMacros.push_back("TESTSUITE");