diff --git a/pkgs/by-name/ac/aces-container/package.nix b/pkgs/by-name/ac/aces-container/package.nix
index 0d55b2e74a30..64274f660acf 100644
--- a/pkgs/by-name/ac/aces-container/package.nix
+++ b/pkgs/by-name/ac/aces-container/package.nix
@@ -20,6 +20,8 @@ stdenv.mkDerivation (finalAttrs: {
     cmake
   ];
 
+  env.NIX_CFLAGS_COMPILE = lib.optionalString stdenv.cc.isClang "-Wno-c++11-narrowing";
+
   meta = {
     description = "Reference Implementation of SMPTE ST2065-4";
     homepage = "https://github.com/ampas/aces_container";