diff --git a/nixos/modules/services/mail/roundcube.nix b/nixos/modules/services/mail/roundcube.nix
index 66b1c1e3e6f..e8b2e11bf72 100644
--- a/nixos/modules/services/mail/roundcube.nix
+++ b/nixos/modules/services/mail/roundcube.nix
@@ -141,27 +141,31 @@ in
 
     systemd.services.roundcube-setup = let
       pgSuperUser = config.services.postgresql.superUser;
-    in {
-      requires = [ "postgresql.service" ];
-      after = [ "postgresql.service" ];
-      wantedBy = [ "multi-user.target" ];
-      path = [ config.services.postgresql.package ];
-      script = ''
-        mkdir -p /var/lib/roundcube
-        if [ ! -f /var/lib/roundcube/db-created ]; then
-          if [ "${cfg.database.host}" = "localhost" ]; then
-            ${pkgs.sudo}/bin/sudo -u ${pgSuperUser} psql postgres -c "create role ${cfg.database.username} with login password '${cfg.database.password}'";
-            ${pkgs.sudo}/bin/sudo -u ${pgSuperUser} psql postgres -c "create database ${cfg.database.dbname} with owner ${cfg.database.username}";
+    in mkMerge [
+      (mkIf (cfg.database.host == "localhost") {
+        requires = [ "postgresql.service" ];
+        after = [ "postgresql.service" ];
+        path = [ config.services.postgresql.package ];
+      })
+      {
+        wantedBy = [ "multi-user.target" ];
+        script = ''
+          mkdir -p /var/lib/roundcube
+          if [ ! -f /var/lib/roundcube/db-created ]; then
+            if [ "${cfg.database.host}" = "localhost" ]; then
+              ${pkgs.sudo}/bin/sudo -u ${pgSuperUser} psql postgres -c "create role ${cfg.database.username} with login password '${cfg.database.password}'";
+              ${pkgs.sudo}/bin/sudo -u ${pgSuperUser} psql postgres -c "create database ${cfg.database.dbname} with owner ${cfg.database.username}";
+            fi
+            PGPASSWORD=${cfg.database.password} ${pkgs.postgresql}/bin/psql -U ${cfg.database.username} \
+              -f ${cfg.package}/SQL/postgres.initial.sql \
+              -h ${cfg.database.host} ${cfg.database.dbname}
+            touch /var/lib/roundcube/db-created
           fi
-          PGPASSWORD=${cfg.database.password} ${pkgs.postgresql}/bin/psql -U ${cfg.database.username} \
-            -f ${cfg.package}/SQL/postgres.initial.sql \
-            -h ${cfg.database.host} ${cfg.database.dbname}
-          touch /var/lib/roundcube/db-created
-        fi
 
-        ${pkgs.php}/bin/php ${cfg.package}/bin/update.sh
-      '';
-      serviceConfig.Type = "oneshot";
-    };
+          ${pkgs.php}/bin/php ${cfg.package}/bin/update.sh
+        '';
+        serviceConfig.Type = "oneshot";
+      }
+    ];
   };
 }
diff --git a/pkgs/servers/roundcube/0001-Don-t-resolve-symlinks-when-trying-to-find-INSTALL_P.patch b/pkgs/servers/roundcube/0001-Don-t-resolve-symlinks-when-trying-to-find-INSTALL_P.patch
new file mode 100644
index 00000000000..96710d6162d
--- /dev/null
+++ b/pkgs/servers/roundcube/0001-Don-t-resolve-symlinks-when-trying-to-find-INSTALL_P.patch
@@ -0,0 +1,27 @@
+From c1832eabb99cec47f1714f696275285e1e28da34 Mon Sep 17 00:00:00 2001
+From: Maximilian Bosch <maximilian@mbosch.me>
+Date: Tue, 2 Apr 2019 16:20:50 +0200
+Subject: [PATCH] Don't resolve symlinks when trying to find INSTALL_PATH
+
+Nix specific patch. This behavior breaks roundcube setups where plugins
+are in a store path with symlinks to the actual source.
+---
+ bin/update.sh | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/bin/update.sh b/bin/update.sh
+index 08e3bb5..b2ad498 100755
+--- a/bin/update.sh
++++ b/bin/update.sh
+@@ -19,7 +19,7 @@
+  +-----------------------------------------------------------------------+
+ */
+ 
+-define('INSTALL_PATH', realpath(__DIR__ . '/..') . '/' );
++define('INSTALL_PATH', __DIR__ . '/../' );
+ 
+ require_once INSTALL_PATH . 'program/include/clisetup.php';
+ 
+-- 
+2.19.2
+
diff --git a/pkgs/servers/roundcube/default.nix b/pkgs/servers/roundcube/default.nix
index cda5ae1d6c5..685e856644e 100644
--- a/pkgs/servers/roundcube/default.nix
+++ b/pkgs/servers/roundcube/default.nix
@@ -1,14 +1,21 @@
-{ lib, stdenv, fetchzip, buildEnv, roundcube, roundcubePlugins }:
-let
+{ lib, fetchurl, stdenv, buildEnv, roundcube, roundcubePlugins }:
+
+stdenv.mkDerivation rec {
+  pname = "roundcube";
   version = "1.3.8";
-in
-fetchzip rec {
-  name= "roundcube-${version}";
 
-  url = "https://github.com/roundcube/roundcubemail/releases/download/${version}/roundcubemail-${version}-complete.tar.gz";
-  sha256 = "1lhwr13bglm8rqgamnb480b07wpqhw9bskjj2xxb0x8kdjly29ks";
+  src = fetchurl {
+    url = "https://github.com/roundcube/roundcubemail/releases/download/${version}/roundcubemail-${version}-complete.tar.gz";
+    sha256 = "018djad7ygfl9c9f2l2j42qkg31ml3hs2f01f0dk361zckwk77n4";
+  };
 
-  extraPostFetch = ''
+  patches = [ ./0001-Don-t-resolve-symlinks-when-trying-to-find-INSTALL_P.patch ];
+
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir $out
+    cp -r * $out/
     ln -sf /etc/roundcube/config.inc.php $out/config/config.inc.php
     rm -rf $out/installer
   '';