diff --git a/pkgs/servers/samba/default.nix b/pkgs/servers/samba/default.nix
index 50228766977..e8b1edc80e3 100644
--- a/pkgs/servers/samba/default.nix
+++ b/pkgs/servers/samba/default.nix
@@ -10,7 +10,8 @@ stdenv.mkDerivation rec {
 
   buildInputs = [readline pam openldap kerberos popt iniparser libunwind fam];
   configureFlags = ''--with-pam --with-smbmount --datadir=$out/share
-  --with-aio-support --with-libiconv=${stdenv.gcc.libc}'';
+  --with-aio-support''
+  + (if (stdenv.gcc.libc != null) then "--with-libiconv=${stdenv.gcc.libc}" else "");
   postUnpack = "sourceRoot=\$sourceRoot/source";
   
   configFile = ./smb.conf;