diff --git a/protobuf/compiler/src/google/protobuf/compiler/j2objc/j2objc_helpers.cc b/protobuf/compiler/src/google/protobuf/compiler/j2objc/j2objc_helpers.cc
index 6e6229db86..bb5b46b251 100644
--- a/protobuf/compiler/src/google/protobuf/compiler/j2objc/j2objc_helpers.cc
+++ b/protobuf/compiler/src/google/protobuf/compiler/j2objc/j2objc_helpers.cc
@@ -78,18 +78,67 @@ static bool stripNonfunctionalCodegen = false;
 // collide with pre-existing code (which should be cleaned up on-demand as
 // needed)
 const std::set<absl::string_view> kKeywords = {
-    "DEBUG",       "FALSE",    "FILE",     "NO",        "NO_DATA",
-    "NULL",        "OVERFLOW", "TRUE",     "TYPE_BOOL", "YES",
-    "and",         "auto",     "break",    "case",      "class",
-    "const",       "continue", "copy",     "default",   "delete",
-    "description", "do",       "double",   "else",      "enum",
-    "explicit",    "float",    "for",      "hash",      "id",
-    "if",          "inline",   "int",      "long",      "namespace",
-    "new",         "not",      "operator", "or",        "private",
-    "protected",   "public",   "return",   "signed",    "specialCalendars",
-    "static",      "struct",   "switch",   "template",  "text",
-    "this",        "throw",    "try",      "union",     "unsigned",
-    "virtual",     "void",     "volatile", "while",
+    "DEBUG",
+    "FALSE",
+    "FILE",
+    "NO",
+    "NO_DATA",
+    "NULL",
+    "OVERFLOW",
+    "TRUE",
+    "TYPE_BOOL",
+    "YES",
+    "and",
+    "auto",
+    "break",
+    "case",
+    "class",
+    "concept",
+    "const",
+    "continue",
+    "copy",
+    "default",
+    "delete",
+    "description",
+    "do",
+    "double",
+    "else",
+    "enum",
+    "explicit",
+    "float",
+    "for",
+    "hash",
+    "id",
+    "if",
+    "inline",
+    "int",
+    "long",
+    "mutable",
+    "namespace",
+    "new",
+    "not",
+    "operator",
+    "or",
+    "private",
+    "protected",
+    "public",
+    "return",
+    "signed",
+    "specialCalendars",
+    "static",
+    "struct",
+    "switch",
+    "template",
+    "text",
+    "this",
+    "throw",
+    "try",
+    "union",
+    "unsigned",
+    "virtual",
+    "void",
+    "volatile",
+    "while",
 };