diff --git a/pkgs/development/python-modules/onnx/default.nix b/pkgs/development/python-modules/onnx/default.nix
index df15ebe77e44..d0866f6c0a83 100644
--- a/pkgs/development/python-modules/onnx/default.nix
+++ b/pkgs/development/python-modules/onnx/default.nix
@@ -66,14 +66,10 @@ in buildPythonPackage rec {
       --replace 'include(googletest)' ""
     substituteInPlace cmake/unittest.cmake \
       --replace 'googletest)' ')'
-  '' + lib.optionalString stdenv.isLinux ''
+  '' + ''
       # remove this override in 1.15 that will enable to set the CMAKE_CXX_STANDARD with cmakeFlags
       substituteInPlace CMakeLists.txt \
         --replace 'CMAKE_CXX_STANDARD 11' 'CMAKE_CXX_STANDARD 17'
-  '' + lib.optionalString stdenv.isDarwin ''
-      # remove this override in 1.15 that will enable to set the CMAKE_CXX_STANDARD with cmakeFlags
-      substituteInPlace CMakeLists.txt \
-        --replace 'CMAKE_CXX_STANDARD 11' 'CMAKE_CXX_STANDARD 14'
   '';
 
   preConfigure = ''
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 56be7ca8965e..411ef6b35491 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -8384,12 +8384,7 @@ self: super: with self; {
   onlykey-solo-python = callPackage ../development/python-modules/onlykey-solo-python { };
 
   onnx = callPackage ../development/python-modules/onnx {
-    # in linux c++ defaults to 17
-    # on darwin clang is on an old version so c++ defaults to 11
-    abseil-cpp = if stdenv.isLinux then
-        pkgs.abseil-cpp_202301
-      else
-        pkgs.abseil-cpp_202301.override { cxxStandard = "14"; };
+    abseil-cpp = pkgs.abseil-cpp_202301;
   };
 
   onnxconverter-common = callPackage ../development/python-modules/onnxconverter-common {