diff --git a/libcxx/cmake/caches/Generic-assertions.cmake b/libcxx/cmake/caches/Generic-assertions.cmake
--- a/libcxx/cmake/caches/Generic-assertions.cmake
+++ b/libcxx/cmake/caches/Generic-assertions.cmake
@@ -1,3 +1,2 @@
 set(LIBCXX_ENABLE_ASSERTIONS ON CACHE BOOL "")
-set(LIBCXX_TEST_PARAMS "enable_assertions=True" CACHE STRING "")
-set(LIBCXXABI_TEST_PARAMS "enable_assertions=True" CACHE STRING "")
+set(LIBCXXABI_ENABLE_ASSERTIONS ON CACHE BOOL "")
diff --git a/libcxx/test/CMakeLists.txt b/libcxx/test/CMakeLists.txt
--- a/libcxx/test/CMakeLists.txt
+++ b/libcxx/test/CMakeLists.txt
@@ -104,6 +104,10 @@
   serialize_lit_param(enable_debug_tests False)
 endif()
 
+if (LIBCXX_ENABLE_ASSERTIONS)
+  serialize_lit_param(enable_assertions True)
+endif()
+
 if (CMAKE_CXX_COMPILER_TARGET)
   serialize_lit_param(target_triple "\"${CMAKE_CXX_COMPILER_TARGET}\"")
 else()
diff --git a/libcxxabi/test/CMakeLists.txt b/libcxxabi/test/CMakeLists.txt
--- a/libcxxabi/test/CMakeLists.txt
+++ b/libcxxabi/test/CMakeLists.txt
@@ -79,6 +79,10 @@
   serialize_lit_param(enable_exceptions False)
 endif()
 
+if (LIBCXXABI_ENABLE_ASSERTIONS)
+  serialize_lit_param(enable_assertions True)
+endif()
+
 serialize_lit_param(enable_experimental False)
 
 if (LLVM_USE_SANITIZER)