diff --git a/pkgs/tools/security/nmap/default.nix b/pkgs/tools/security/nmap/default.nix
index 4a5627072ca..46966835e14 100644
--- a/pkgs/tools/security/nmap/default.nix
+++ b/pkgs/tools/security/nmap/default.nix
@@ -3,7 +3,7 @@
 , pycairo, pysqlite
 }:
   
-stdenv.mkDerivation (rec {
+stdenv.mkDerivation rec {
   name = "nmap-5.21";
 
   src = fetchurl {
@@ -11,11 +11,20 @@ stdenv.mkDerivation (rec {
     sha256 = "1fmh05iamynmr8zic3bja6dr0pfiwp0hr2nc2wpiqm2pc7w29jwz";
   };
 
-  postInstall =''
-    wrapProgram $out/bin/zenmap --prefix PYTHONPATH : "$(toPythonPath $out)" --prefix PYTHONPATH : "$PYTHONPATH" --prefix PYTHONPATH : $(toPythonPath ${pygtk})/gtk-2.0 --prefix PYTHONPATH : $(toPythonPath ${pygobject})/gtk-2.0 --prefix PYTHONPATH : $(toPythonPath ${pycairo})/gtk-2.0
-  '';
+  patches =
+    [ (fetchurl {
+        url = "http://sources.gentoo.org/cgi-bin/viewvc.cgi/gentoo-x86/net-analyzer/nmap/files/nmap-5.21-openssl-1.patch?revision=1.1";
+        sha256 = "0q0kgwvg5b770xpp31a5a3lxh8d5ik6d5bv11nlh3syd78q6f08y";
+      })
+    ];
 
-  buildInputs = [
-    libpcap libX11 gtk pkgconfig openssl python pygtk makeWrapper pysqlite
-  ];
-})
+  patchFlags = "-p0";
+
+  postInstall =
+    ''
+      wrapProgram $out/bin/zenmap --prefix PYTHONPATH : "$(toPythonPath $out)" --prefix PYTHONPATH : "$PYTHONPATH" --prefix PYTHONPATH : $(toPythonPath ${pygtk})/gtk-2.0 --prefix PYTHONPATH : $(toPythonPath ${pygobject})/gtk-2.0 --prefix PYTHONPATH : $(toPythonPath ${pycairo})/gtk-2.0
+    '';
+
+  buildInputs =
+    [ libpcap libX11 gtk pkgconfig openssl python pygtk makeWrapper pysqlite ];
+}