diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -1168,14 +1168,14 @@
    .. code-block: c++
       #pragma clang max_tokens_here 1234
 
-2. As a per-translation unit limit, using the ``-fmax-tokens`` command-line
+2. As a per-translation unit limit, using the ``-fmax-tokens=`` command-line
    flag:
 
    .. code-block: console
-      clang -c a.cpp -fmax-tokens 1234
+      clang -c a.cpp -fmax-tokens=1234
 
 3. As a per-translation unit limit using the ``clang max_tokens_total`` pragma,
-   which works like and overrides the ``-fmax-tokens`` flag:
+   which works like and overrides the ``-fmax-tokens=`` flag:
 
    .. code-block: c++
       #pragma clang max_file_tokens 1234
diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -646,9 +646,8 @@
 def interface_stub_version_EQ : JoinedOrSeparate<["-"], "interface-stub-version=">, Flags<[CC1Option]>;
 def exported__symbols__list : Separate<["-"], "exported_symbols_list">;
 def e : JoinedOrSeparate<["-"], "e">, Group<Link_Group>;
-def fmax_tokens : Separate<["-"], "fmax-tokens">,
-  HelpText<"Max total number of preprocessed tokens for -Wmax-tokens.">,
-  Group<f_Group>, Flags<[CC1Option]>;
+def fmax_tokens_EQ : Joined<["-"], "fmax-tokens=">, Group<f_Group>, Flags<[CC1Option]>,
+  HelpText<"Max total number of preprocessed tokens for -Wmax-tokens.">;
 def fPIC : Flag<["-"], "fPIC">, Group<f_Group>;
 def fno_PIC : Flag<["-"], "fno-PIC">, Group<f_Group>;
 def fPIE : Flag<["-"], "fPIE">, Group<f_Group>;
diff --git a/clang/lib/Driver/ToolChains/Clang.cpp b/clang/lib/Driver/ToolChains/Clang.cpp
--- a/clang/lib/Driver/ToolChains/Clang.cpp
+++ b/clang/lib/Driver/ToolChains/Clang.cpp
@@ -5731,7 +5731,7 @@
   Args.AddLastArg(CmdArgs, options::OPT_dM);
   Args.AddLastArg(CmdArgs, options::OPT_dD);
 
-  Args.AddLastArg(CmdArgs, options::OPT_fmax_tokens);
+  Args.AddLastArg(CmdArgs, options::OPT_fmax_tokens_EQ);
 
   // Handle serialized diagnostics.
   if (Arg *A = Args.getLastArg(options::OPT__serialize_diags)) {
diff --git a/clang/lib/Frontend/CompilerInvocation.cpp b/clang/lib/Frontend/CompilerInvocation.cpp
--- a/clang/lib/Frontend/CompilerInvocation.cpp
+++ b/clang/lib/Frontend/CompilerInvocation.cpp
@@ -3320,7 +3320,7 @@
   Opts.CompleteMemberPointers = Args.hasArg(OPT_fcomplete_member_pointers);
   Opts.BuildingPCHWithObjectFile = Args.hasArg(OPT_building_pch_with_obj);
 
-  Opts.MaxTokens = getLastArgIntValue(Args, OPT_fmax_tokens, 0, Diags);
+  Opts.MaxTokens = getLastArgIntValue(Args, OPT_fmax_tokens_EQ, 0, Diags);
 }
 
 static bool isStrictlyPreprocessorAction(frontend::ActionKind Action) {
diff --git a/clang/lib/Parse/Parser.cpp b/clang/lib/Parse/Parser.cpp
--- a/clang/lib/Parse/Parser.cpp
+++ b/clang/lib/Parse/Parser.cpp
@@ -650,7 +650,7 @@
     return false;
 
   case tok::eof:
-    // Check whether -fmax-tokens was reached.
+    // Check whether -fmax-tokens= was reached.
     if (PP.getMaxTokens() != 0 && PP.getTokenCount() > PP.getMaxTokens()) {
       PP.Diag(Tok.getLocation(), diag::warn_max_tokens_total)
           << PP.getTokenCount() << PP.getMaxTokens();
diff --git a/clang/test/Parser/max-tokens.cpp b/clang/test/Parser/max-tokens.cpp
--- a/clang/test/Parser/max-tokens.cpp
+++ b/clang/test/Parser/max-tokens.cpp
@@ -1,6 +1,6 @@
 // RUN: %clang_cc1 -fsyntax-only -verify %s
-// RUN: %clang_cc1 -fsyntax-only -verify %s -DMAX_TOKENS          -fmax-tokens 2
-// RUN: %clang_cc1 -fsyntax-only -verify %s -DMAX_TOKENS_OVERRIDE -fmax-tokens 9
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DMAX_TOKENS          -fmax-tokens=2
+// RUN: %clang_cc1 -fsyntax-only -verify %s -DMAX_TOKENS_OVERRIDE -fmax-tokens=9
 
 int x, y, z;