diff --git a/clang/lib/APINotes/APINotesYAMLCompiler.cpp b/clang/lib/APINotes/APINotesYAMLCompiler.cpp
index 7cfdefc2e3de8..e430956e28d08 100644
--- a/clang/lib/APINotes/APINotesYAMLCompiler.cpp
+++ b/clang/lib/APINotes/APINotesYAMLCompiler.cpp
@@ -28,8 +28,6 @@ using namespace api_notes;
 namespace {
 enum class APIAvailability {
   Available = 0,
-  OSX,
-  IOS,
   None,
   NonSwift,
 };
@@ -39,8 +37,6 @@ namespace llvm {
 namespace yaml {
 template <> struct ScalarEnumerationTraits<APIAvailability> {
   static void enumeration(IO &IO, APIAvailability &AA) {
-    IO.enumCase(AA, "OSX", APIAvailability::OSX);
-    IO.enumCase(AA, "iOS", APIAvailability::IOS);
     IO.enumCase(AA, "none", APIAvailability::None);
     IO.enumCase(AA, "nonswift", APIAvailability::NonSwift);
     IO.enumCase(AA, "available", APIAvailability::Available);