diff --git a/pkgs/development/libraries/libaom/default.nix b/pkgs/development/libraries/libaom/default.nix
index 0522cdf2d50..e35f8385915 100644
--- a/pkgs/development/libraries/libaom/default.nix
+++ b/pkgs/development/libraries/libaom/default.nix
@@ -32,9 +32,9 @@ stdenv.mkDerivation rec {
   cmakeFlags = [
     "-DBUILD_SHARED_LIBS=ON"
     "-DENABLE_TESTS=OFF"
-  ] ++ lib.optionals stdenv.isDarwin [
+  ] ++ lib.optionals (stdenv.isDarwin && stdenv.isAarch64) [
     # CPU detection isn't supported on Darwin and breaks the aarch64-darwin build:
-    "-DCONFIG_RUNTIME_CPU_DETECT=OFF"
+    "-DCONFIG_RUNTIME_CPU_DETECT=0"
   ];
 
   postFixup = ''