diff --git a/sycl/include/sycl/aliases.hpp b/sycl/include/sycl/aliases.hpp
index cc3fc0ab06352..ad6c63b18742a 100644
--- a/sycl/include/sycl/aliases.hpp
+++ b/sycl/include/sycl/aliases.hpp
@@ -65,8 +65,15 @@ class half;
 
 // FIXME: OpenCL vector aliases are not defined by SYCL 2020 spec and should be
 //        removed from here. See intel/llvm#7888
+// FIXME: schar, longlong and ulonglong aliases are not defined by SYCL 2020
+//        spec, but they are preserved in SYCL 2020 mode, because SYCL-CTS is
+//        still using them.
+//        See KhronosGroup/SYCL-CTS#446 and KhronosGroup/SYCL-Docs#335
 #define __SYCL_2020_MAKE_VECTOR_ALIASES_FOR_VECTOR_LENGTH(N)                   \
   __SYCL_MAKE_VECTOR_ALIASES_FOR_OPENCL_TYPES(N)                               \
+  __SYCL_MAKE_VECTOR_ALIAS(schar, std::int8_t, N)                              \
+  __SYCL_MAKE_VECTOR_ALIAS(longlong, std::int64_t, N)                          \
+  __SYCL_MAKE_VECTOR_ALIAS(ulonglong, std::uint64_t, N)                        \
   __SYCL_MAKE_VECTOR_ALIAS(char, std::int8_t, N)                               \
   __SYCL_MAKE_VECTOR_ALIAS(uchar, std::uint8_t, N)                             \
   __SYCL_MAKE_VECTOR_ALIAS(short, std::int16_t, N)                             \
diff --git a/sycl/test/basic_tests/vectors/aliases.cpp b/sycl/test/basic_tests/vectors/aliases.cpp
index 399d32e1ac71c..3cc7a7b9c2aaf 100644
--- a/sycl/test/basic_tests/vectors/aliases.cpp
+++ b/sycl/test/basic_tests/vectors/aliases.cpp
@@ -10,6 +10,9 @@
       std::is_same_v<sycl::type##elems, sycl::vec<storage_type, elems>>);
 
 #define CHECK_ALIASES_FOR_VEC_LENGTH(N)                                        \
+  CHECK_ALIAS(schar, std::int8_t, N)                                           \
+  CHECK_ALIAS(longlong, std::int64_t, N)                                       \
+  CHECK_ALIAS(ulonglong, std::uint64_t, N)                                     \
   CHECK_ALIAS(char, std::int8_t, N)                                            \
   CHECK_ALIAS(uchar, std::uint8_t, N)                                          \
   CHECK_ALIAS(short, std::int16_t, N)                                          \