diff --git a/pkgs/misc/drivers/epkowa/default.nix b/pkgs/misc/drivers/epkowa/default.nix
index c8c0ecb872e..964618f1fc6 100644
--- a/pkgs/misc/drivers/epkowa/default.nix
+++ b/pkgs/misc/drivers/epkowa/default.nix
@@ -153,6 +153,39 @@ let plugins = {
 
     meta = common_meta // { description = "iscan esci s80 plugin for "+passthru.hw; };
   };
+  s650 = stdenv.mkDerivation rec {
+    name = "iscan-gt-s650-bundle";
+    version = "2.30.4";
+
+    src = fetchurl {
+      urls = [
+        "https://download2.ebz.epson.net/iscan/plugin/gt-s650/rpm/x64/iscan-gt-s650-bundle-${version}.x64.rpm.tar.gz"
+        "https://web.archive.org/web/https://download2.ebz.epson.net/iscan/plugin/gt-s650/rpm/x64/iscan-gt-s650-bundle-${version}.x64.rpm.tar.gz"
+      ];
+      sha256 = "1ffddf488c5fc1eb39452499951bd13a2dc1971980c0551176076c81af363038";
+    };
+
+    nativeBuildInputs = [ autoPatchelfHook rpm ];
+
+    installPhase = ''
+      cd plugins
+      ${rpm}/bin/rpm2cpio iscan-plugin-gt-s650-*.x86_64.rpm | ${cpio}/bin/cpio -idmv
+      mkdir $out
+      cp -r usr/share $out
+      cp -r usr/lib64 $out/lib
+      mv $out/share/iscan $out/share/esci
+      mv $out/lib/iscan $out/lib/esci
+      '';
+
+    passthru = {
+      registrationCommand = ''
+        $registry --add interpreter usb 0x04b8 0x013c "$plugin/lib/esci/libiscan-plugin-gt-s650 $plugin/share/esci/esfw010c.bin"
+        $registry --add interpreter usb 0x04b8 0x013d "$plugin/lib/esci/libiscan-plugin-gt-s650 $plugin/share/esci/esfw010c.bin"
+        '';
+      hw = "GT-S650, Perfection V19, Perfection V39";
+    };
+    meta = common_meta // { description = "iscan GT-S650 for "+passthru.hw; };
+  };
   network = stdenv.mkDerivation rec {
     pname = "iscan-nt-bundle";
     # for the version, look for the driver of XP-750 in the search page
diff --git a/pkgs/misc/drivers/epkowa/firmware_location.patch b/pkgs/misc/drivers/epkowa/firmware_location.patch
index 58ea849d8f9..0f723a4ff9d 100644
--- a/pkgs/misc/drivers/epkowa/firmware_location.patch
+++ b/pkgs/misc/drivers/epkowa/firmware_location.patch
@@ -8,12 +8,13 @@ set this environment variable. Instead, we patch iscan to set this variable
 before loading libesci-interpreter-gt-f720.so.
 --- backend/channel-usb.c.orig	2017-08-14 11:24:27.669582456 +0200
 +++ backend/channel-usb.c	2017-08-14 11:31:40.509010897 +0200
-@@ -169,6 +169,9 @@
+@@ -169,6 +169,10 @@
  {
    SANE_Status s;
  
 +  setenv("ESCI_FIRMWARE_DIR", NIX_ESCI_PREFIX, 1);
 +  setenv("ISCAN_FW_DIR", NIX_ESCI_PREFIX, 1);
++  setenv("ISCAN_FIRMWARE_DIR", NIX_ESCI_PREFIX, 1);
 +
    s = sanei_usb_open (self->name, &self->fd);