--- a/clang/lib/Driver/ToolChains/Arch/X86.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/X86.cpp
@@ -105,8 +105,8 @@ const char *x86::getX86TargetCPU(const ArgList &Args,
   case llvm::Triple::Haiku:
     return "i586";
   default:
-    // Fallback to p4.
-    return "pentium4";
+    // Fallback to i686.
+    return "i686";
   }
 }