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
@@ -6756,8 +6756,6 @@
          "lib_6_3, lib_6_4, lib_6_5, lib_6_6, lib_6_7, lib_6_x,"
          "ms_6_5, ms_6_6, ms_6_7,"
          "as_6_5, as_6_6, as_6_7">;
-def dxc_D : Option<["--", "/", "-"], "D", KIND_JOINED_OR_SEPARATE>,
-  Group<dxc_Group>, Flags<[DXCOption, NoXarchOption]>, Alias<D>;
 def emit_pristine_llvm : DXCFlag<"emit-pristine-llvm">,
   HelpText<"Emit pristine LLVM IR from the frontend by not running any LLVM passes at all."
            "Same as -S + -emit-llvm + -disable-llvm-passes.">;
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
@@ -3471,9 +3471,9 @@
 
 static void RenderHLSLOptions(const ArgList &Args, ArgStringList &CmdArgs,
                               types::ID InputType) {
-  const unsigned ForwardedArguments[] = {
-      options::OPT_dxil_validator_version, options::OPT_D, options::OPT_S,
-      options::OPT_emit_llvm, options::OPT_disable_llvm_passes};
+  const unsigned ForwardedArguments[] = {options::OPT_dxil_validator_version,
+                                         options::OPT_S, options::OPT_emit_llvm,
+                                         options::OPT_disable_llvm_passes};
 
   for (const auto &Arg : ForwardedArguments)
     if (const auto *A = Args.getLastArg(Arg))
diff --git a/clang/test/Driver/dxc_D.hlsl b/clang/test/Driver/dxc_D.hlsl
deleted file mode 100644
--- a/clang/test/Driver/dxc_D.hlsl
+++ /dev/null
@@ -1,13 +0,0 @@
-// RUN: %clang_dxc -DTEST=2  -### %s 2>&1 | FileCheck %s
-// RUN: %clang_dxc -DTEST=2  -Tlib_6_7 %s -fcgl -Fo - | FileCheck %s --check-prefix=ERROR
-
-// Make sure -D send to cc1.
-// CHECK:"-D" "TEST=2"
-
-#ifndef TEST
-#error "TEST not defined"
-#elif TEST != 2
-#error "TEST defined to wrong value"
-#endif
-
-// ERROR-NOT: error: