diff --git a/clang/lib/Basic/IdentifierTable.cpp b/clang/lib/Basic/IdentifierTable.cpp
index b295008..40b2822 100644
--- a/clang/lib/Basic/IdentifierTable.cpp
+++ b/clang/lib/Basic/IdentifierTable.cpp
@@ -647,16 +647,17 @@
   llvm_unreachable("Invalid OverloadedOperatorKind!");
 }
 
-StringRef clang::getNullabilitySpelling(NullabilityKind kind) {
+StringRef clang::getNullabilitySpelling(NullabilityKind kind,
+                                        bool isContextSensitive) {
   switch (kind) {
   case NullabilityKind::NonNull:
-    return "__nonnull";
+    return isContextSensitive ? "nonnull" : "_Nonnull";
 
   case NullabilityKind::Nullable:
-    return "__nullable";
+    return isContextSensitive ? "nullable" : "_Nullable";
 
   case NullabilityKind::Unspecified:
-    return "__null_unspecified";
+    return isContextSensitive ? "null_unspecified" : "_Null_unspecified";
   }
   llvm_unreachable("Unknown nullability kind.");
 }