diff --git a/clang/include/clang/Driver/Options.td b/clang/include/clang/Driver/Options.td
index 7d719234192a9..9e25a5e0b58a5 100644
--- a/clang/include/clang/Driver/Options.td
+++ b/clang/include/clang/Driver/Options.td
@@ -4773,7 +4773,6 @@ def _warn__EQ : Joined<["--"], "warn-=">, Alias<W_Joined>;
 def _warn_ : Joined<["--"], "warn-">, Alias<W_Joined>;
 def _write_dependencies : Flag<["--"], "write-dependencies">, Alias<MD>;
 def _write_user_dependencies : Flag<["--"], "write-user-dependencies">, Alias<MMD>;
-def _ : Joined<["--"], "">, Flags<[Unsupported]>;
 
 // Hexagon feature flags.
 let Flags = [TargetSpecific] in {
diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index a43d3f07bc1d3..b34003041373f 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -286,19 +286,9 @@ InputArgList Driver::ParseArgStrings(ArrayRef<const char *> ArgStrings,
   // Check for unsupported options.
   for (const Arg *A : Args) {
     if (A->getOption().hasFlag(options::Unsupported)) {
-      unsigned DiagID;
-      auto ArgString = A->getAsString(Args);
-      std::string Nearest;
-      if (getOpts().findNearest(
-            ArgString, Nearest, IncludedFlagsBitmask,
-            ExcludedFlagsBitmask | options::Unsupported) > 1) {
-        DiagID = diag::err_drv_unsupported_opt;
-        Diag(DiagID) << ArgString;
-      } else {
-        DiagID = diag::err_drv_unsupported_opt_with_suggestion;
-        Diag(DiagID) << ArgString << Nearest;
-      }
-      ContainsError |= Diags.getDiagnosticLevel(DiagID, SourceLocation()) >
+      Diag(diag::err_drv_unsupported_opt) << A->getAsString(Args);
+      ContainsError |= Diags.getDiagnosticLevel(diag::err_drv_unsupported_opt,
+                                                SourceLocation()) >
                        DiagnosticsEngine::Warning;
       continue;
     }
diff --git a/clang/test/Driver/unsupported-option.c b/clang/test/Driver/unsupported-option.c
index 3f4227b52b3ba..6be531d9df7de 100644
--- a/clang/test/Driver/unsupported-option.c
+++ b/clang/test/Driver/unsupported-option.c
@@ -1,10 +1,10 @@
 // RUN: not %clang %s --hedonism -### 2>&1 | \
 // RUN: FileCheck %s
-// CHECK: error: unsupported option '--hedonism'
+// CHECK: error: unknown argument: '--hedonism'
 
 // RUN: not %clang %s --hell -### 2>&1 | \
 // RUN: FileCheck %s --check-prefix=DID-YOU-MEAN
-// DID-YOU-MEAN: error: unsupported option '--hell'; did you mean '--help'?
+// DID-YOU-MEAN: error: unknown argument '--hell'; did you mean '--help'?
 
 // RUN: not %clang --target=powerpc-ibm-aix %s -mlong-double-128 2>&1 | \
 // RUN: FileCheck %s --check-prefix=AIX-LONGDOUBLE128-ERR
diff --git a/flang/test/Driver/driver-version.f90 b/flang/test/Driver/driver-version.f90
index 44c5b8a931821..d1e1e1d90fe1f 100644
--- a/flang/test/Driver/driver-version.f90
+++ b/flang/test/Driver/driver-version.f90
@@ -9,7 +9,7 @@
 ! VERSION-NEXT: Thread model:
 ! VERSION-NEXT: InstalledDir:
 
-! ERROR: flang-new: error: unsupported option '--versions'; did you mean '--version'?
+! ERROR: flang-new: error: unknown argument '--versions'; did you mean '--version'?
 
 ! VERSION-FC1: LLVM version