diff --git a/pkgs/development/libraries/tezos-rust-libs/default.nix b/pkgs/development/libraries/tezos-rust-libs/default.nix
index 72163acba83..e59e5858eaa 100644
--- a/pkgs/development/libraries/tezos-rust-libs/default.nix
+++ b/pkgs/development/libraries/tezos-rust-libs/default.nix
@@ -1,4 +1,4 @@
-{ lib, fetchFromGitLab, stdenv, llvmPackages_12, cargo }:
+{ lib, fetchFromGitLab, stdenv, llvmPackages_12, cargo, libiconv }:
 
 stdenv.mkDerivation rec {
   version = "1.5";
@@ -12,6 +12,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ llvmPackages_12.llvm cargo ];
   propagatedBuildDeps = [ llvmPackages_12.libllvm ];
+  buildInputs = lib.optionals stdenv.isDarwin [ libiconv ];
 
   buildPhase = ''
     runHook preBuild