diff --git a/pkgs/applications/networking/mailreaders/mblaze/default.nix b/pkgs/applications/networking/mailreaders/mblaze/default.nix
index 30c392b55e4..6cfac41676c 100644
--- a/pkgs/applications/networking/mailreaders/mblaze/default.nix
+++ b/pkgs/applications/networking/mailreaders/mblaze/default.nix
@@ -1,9 +1,11 @@
-{ stdenv, fetchFromGitHub }:
+{ stdenv, fetchFromGitHub, libiconv }:
 
 stdenv.mkDerivation rec {
   name = "mblaze-${version}";
   version = "0.3";
 
+  buildInputs = stdenv.lib.optionals stdenv.isDarwin [ libiconv ];
+
   src = fetchFromGitHub {
     owner = "chneukirchen";
     repo = "mblaze";