diff --git a/include/clang/AST/ASTContext.h b/include/clang/AST/ASTContext.h
index c06c5b4cafb8ba4aa9c602f10390ab863faec0df..da288c4fe5ede3532005d039a921b41f0a55faba 100644
--- a/include/clang/AST/ASTContext.h
+++ b/include/clang/AST/ASTContext.h
@@ -1869,14 +1869,14 @@ public:
         return true;
       
       if (IsParam) {
-        // Ok for the superclass method parameter to be “nonnull” and the subclass
-        // method parameter to be “nullable”
+        // Ok for the superclass method parameter to be "nonnull" and the subclass
+        // method parameter to be "nullable"
         return (*SuperTnullability == NullabilityKind::NonNull &&
                 *SubTnullability == NullabilityKind::Nullable);
       }
       else {
-        // For the return type, it’s okay for the superclass method to specify
-        // “nullable” and the subclass method specify “nonnull”
+        // For the return type, it's okay for the superclass method to specify
+        // "nullable" and the subclass method specify "nonnull"
         return (*SuperTnullability == NullabilityKind::Nullable &&
                 *SubTnullability == NullabilityKind::NonNull);
       }