diff --git a/libcxx/cmake/caches/AMDGPU.cmake b/libcxx/cmake/caches/AMDGPU.cmake
index 7443470b2e8a8e..c7d6afc854a54c 100644
--- a/libcxx/cmake/caches/AMDGPU.cmake
+++ b/libcxx/cmake/caches/AMDGPU.cmake
@@ -1,5 +1,4 @@
 # Configuration options for libcxx.
-set(LIBCXX_ABI_VERSION 2 CACHE STRING "")
 set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
 set(LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")
diff --git a/libcxx/cmake/caches/NVPTX.cmake b/libcxx/cmake/caches/NVPTX.cmake
index 3685ddcbb66624..231b457d3017e8 100644
--- a/libcxx/cmake/caches/NVPTX.cmake
+++ b/libcxx/cmake/caches/NVPTX.cmake
@@ -1,5 +1,4 @@
 # Configuration options for libcxx.
-set(LIBCXX_ABI_VERSION 2 CACHE STRING "")
 set(LIBCXX_CXX_ABI libcxxabi CACHE STRING "")
 set(LIBCXX_ENABLE_EXCEPTIONS OFF CACHE BOOL "")
 set(LIBCXX_ENABLE_FILESYSTEM OFF CACHE BOOL "")