diff --git a/pkgs/development/libraries/StormLib/default.nix b/pkgs/development/libraries/StormLib/default.nix
index cbf33e7a2cb..bc247e95623 100644
--- a/pkgs/development/libraries/StormLib/default.nix
+++ b/pkgs/development/libraries/StormLib/default.nix
@@ -11,10 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "1rcdl6ryrr8fss5z5qlpl4prrw8xpbcdgajg2hpp0i7fpk21ymcc";
   };
 
-  # Fixes a build failure on aarch64-darwin. Define for all Darwin targets for when x86_64-darwin
-  # upgrades to a newer SDK.
-  NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-DTARGET_OS_IPHONE=0";
-
   postPatch = ''
     substituteInPlace CMakeLists.txt \
       --replace "FRAMEWORK DESTINATION /Library/Frameworks" "FRAMEWORK DESTINATION Library/Frameworks"
diff --git a/pkgs/development/libraries/libtomcrypt/default.nix b/pkgs/development/libraries/libtomcrypt/default.nix
index 929e62ca2b8..c4dbc11c76c 100644
--- a/pkgs/development/libraries/libtomcrypt/default.nix
+++ b/pkgs/development/libraries/libtomcrypt/default.nix
@@ -9,6 +9,10 @@ stdenv.mkDerivation rec {
     sha256 = "113vfrgapyv72lalhd3nkw7jnks8az0gcb5wqn9hj19nhcxlrbcn";
   };
 
+  # Fixes a build failure on aarch64-darwin. Define for all Darwin targets for when x86_64-darwin
+  # upgrades to a newer SDK.
+  NIX_CFLAGS_COMPILE = lib.optional stdenv.isDarwin "-DTARGET_OS_IPHONE=0";
+
   patches = [
     (fetchpatch {
       name = "CVE-2019-17362.patch";