diff --git a/pkgs/tools/networking/openconnect.nix b/pkgs/tools/networking/openconnect.nix
index d15b4cb59df..2cc52fe981b 100644
--- a/pkgs/tools/networking/openconnect.nix
+++ b/pkgs/tools/networking/openconnect.nix
@@ -1,26 +1,25 @@
 { stdenv, fetchurl, pkgconfig, vpnc, openssl, libxml2 } :
 
 stdenv.mkDerivation rec {
-  name = "openconnect-5.00";
+  name = "openconnect-5.01";
 
   src = fetchurl {
     urls = [
       "ftp://ftp.infradead.org/pub/openconnect/${name}.tar.gz"
     ];
-    sha256 = "8bacd8d00b2c0ecf35594a8417e695b5ed3a7757467f22f980134de81ee7713a";
+    sha256 = "1l90ks87iwmy7jprav11lhjr4n18ycy0d9fndspg50p9qd3jlvwi";
   };
 
   preConfigure = ''
       export PKG_CONFIG=${pkgconfig}/bin/pkg-config
       export LIBXML2_CFLAGS="-I ${libxml2}/include/libxml2"
       export LIBXML2_LIBS="-L${libxml2}/lib -lxml2"
-      export CFLAGS="-D NO_BROKEN_DTLS_CHECK $CFLAGS"
     '';
 
   configureFlags = [
     "--with-vpnc-script=${vpnc}/etc/vpnc/vpnc-script"
     "--disable-nls"
-
+    "--without-openssl-version-check"
   ];
 
   propagatedBuildInputs = [ vpnc openssl libxml2 ];