diff --git a/default.nix b/default.nix
index 0f2a8f43..e0055478 100644
--- a/default.nix
+++ b/default.nix
@@ -38,6 +38,7 @@ let
     inherit lib hostPlatform rustPlatform;
     fetchFromGitHub = pkgs.fetchFromGitHub;
     stdenv = pkgs.stdenv;
+    libiconv = pkgs.libiconv;
     darwin = pkgs.darwin;
     installShellFiles = false;
     installShellCompletions = false;
diff --git a/package.nix b/package.nix
index 09af5419..16fc9c96 100644
--- a/package.nix
+++ b/package.nix
@@ -8,6 +8,7 @@
 , installShellCompletions ? stdenv.buildPlatform.canExecute stdenv.hostPlatform
 , installManPages ? stdenv.buildPlatform.canExecute stdenv.hostPlatform
 , notmuch
+, libiconv
 , gpgme
 , buildNoDefaultFeatures ? false
 , buildFeatures ? [ ]
@@ -33,6 +34,7 @@ rustPlatform.buildRustPackage rec {
   cargoTestFlags = [ "--lib" ];
 
   nativeBuildInputs = [ ]
+    ++ lib.optional hostPlatform.isDarwin libiconv
     ++ lib.optional (installManPages || installShellCompletions) installShellFiles;
 
   buildInputs = [ ]