diff --git a/pkgs/development/compilers/teyjus/default.nix b/pkgs/development/compilers/teyjus/default.nix
index fafc58371ef..301915b7a26 100644
--- a/pkgs/development/compilers/teyjus/default.nix
+++ b/pkgs/development/compilers/teyjus/default.nix
@@ -1,11 +1,11 @@
-{ stdenv, fetchzip, omake, ocaml, flex, bison }:
+{ stdenv, fetchurl, omake, ocaml, flex, bison }:
 
 stdenv.mkDerivation {
-  name = "teyjus-2.1";
+  name = "teyjus-2.0b2";
 
-  src = fetchzip {
-    url = https://github.com/teyjus/teyjus/archive/v2.1.tar.gz;
-    sha256 = "064jqf68zpmvndgyhilmxfhnvx1bzm8avhgw82csj5wxw5ky6glz";
+  src = fetchurl {
+    url = "https://teyjus.googlecode.com/files/teyjus-source-2.0-b2.tar.gz";
+    sha256 = "f589fb460d7095a6e674b7a6413772c41b98654c38602c3e8c477a976da99052";
   };
 
   patches = [ ./fix-lex-to-flex.patch ];
diff --git a/pkgs/development/compilers/teyjus/fix-lex-to-flex.patch b/pkgs/development/compilers/teyjus/fix-lex-to-flex.patch
index 52d259bb64d..d2da1d3facc 100644
--- a/pkgs/development/compilers/teyjus/fix-lex-to-flex.patch
+++ b/pkgs/development/compilers/teyjus/fix-lex-to-flex.patch
@@ -1,23 +1,23 @@
---- a/source/OMakefile	1970-01-01 00:00:01.000000000 +0000
-+++ b/source/OMakefile	2016-12-02 08:48:42.000000000 +0000
-@@ -183,18 +183,18 @@
+diff --git a/source/OMakefile b/source/OMakefile
+index 6b19d84..095b8b6 100644
+--- a/source/OMakefile
++++ b/source/OMakefile
+@@ -164,12 +164,17 @@ LNK_MAIN = $(FNT)/linkerfront
  DEP_MAIN = $(FNT)/dependfront
- PAR_MAIN = $(FNT)/parsefront
  
+ ############################################################
++# Nixpkgs specific changes
++#
++
 +LEX = flex
 +
- ############################################################
++############################################################
  # Platform specific changes
  #
  
- if $(mem $(SYSNAME), Linux)
-     YACC = bison -by
--    LEX = flex
-     export
- 
  if $(mem $(OSTYPE), Cygwin Win32)
      YACC = bison -by
 -    LEX = flex
-     CC = i686-pc-mingw32-gcc
+     CFLAGS += -mno-cygwin
      INC_C[] += $(INC)/byteswap $(INC)/search
      export
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 3f5926c1879..ece2f37a354 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -5324,7 +5324,9 @@ in
     lua = lua5_1;
   };
 
-  teyjus = callPackage ../development/compilers/teyjus { };
+  teyjus = callPackage ../development/compilers/teyjus {
+    omake = omake_rc1;
+  };
 
   thrust = callPackage ../development/tools/thrust {
     gconf = pkgs.gnome2.GConf;