diff --git a/pkgs/tools/security/knockknock/default.nix b/pkgs/tools/security/knockknock/default.nix
index 2813149c4df..2341d2110bf 100644
--- a/pkgs/tools/security/knockknock/default.nix
+++ b/pkgs/tools/security/knockknock/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchFromGitHub, buildPythonPackage, python, pycrypto, hping }:
 
-buildPythonPackage  rec {
+buildPythonPackage rec {
   rev  = "bf14bbff";
   name = "knockknock-r${rev}";
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 5f338c0fb41..3cf462adeb3 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1966,7 +1966,7 @@ let
 
   kismet = callPackage ../applications/networking/sniffers/kismet { };
 
-  knockknock = callPackage ../tools/security/knockknock { inherit (pythonPackages) pycrypto; };
+  knockknock = callPackage ../tools/security/knockknock { };
 
   kpcli = callPackage ../tools/security/kpcli { };