diff --git a/pkgs/development/python-modules/pycm/default.nix b/pkgs/development/python-modules/pycm/default.nix
index b750bd30b0a..614393cf2d5 100644
--- a/pkgs/development/python-modules/pycm/default.nix
+++ b/pkgs/development/python-modules/pycm/default.nix
@@ -1,4 +1,4 @@
-{ lib, buildPythonPackage, fetchFromGitHub, isPy3k, numpy, pytest }:
+{ lib, buildPythonPackage, fetchFromGitHub, isPy3k, matplotlib, numpy, pytest, seaborn }:
 
 buildPythonPackage rec {
   pname = "pycm";
@@ -20,7 +20,7 @@ buildPythonPackage rec {
   '';
 
   checkInputs = [ pytest ];
-  propagatedBuildInputs = [ numpy ];
+  propagatedBuildInputs = [ matplotlib numpy seaborn ];
 
   checkPhase = ''
     pytest Test/