diff --git a/llvm/lib/Target/X86/X86Subtarget.cpp b/llvm/lib/Target/X86/X86Subtarget.cpp
index 8ad8d423d10cc..3745c1e379b1b 100644
--- a/llvm/lib/Target/X86/X86Subtarget.cpp
+++ b/llvm/lib/Target/X86/X86Subtarget.cpp
@@ -280,7 +280,7 @@ void X86Subtarget::initSubtargetFeatures(StringRef CPU, StringRef TuneCPU,
   }
 
   // Disable 64-bit only features in non-64-bit mode.
-  SmallVector<StringRef, 9> FeaturesIn64BitOnly = {
+  StringRef FeaturesIn64BitOnly[] = {
       "egpr", "push2pop2", "ppx", "ndd", "ccmp", "nf", "cf", "zu", "uintr"};
   if (FullFS.find("-64bit-mode") != std::string::npos)
     for (StringRef F : FeaturesIn64BitOnly)