diff --git a/pkgs/development/python-modules/icnsutil/default.nix b/pkgs/development/python-modules/icnsutil/default.nix
index 8061c62feb22..6952aa33397f 100644
--- a/pkgs/development/python-modules/icnsutil/default.nix
+++ b/pkgs/development/python-modules/icnsutil/default.nix
@@ -4,6 +4,7 @@
   fetchFromGitHub,
   python,
   pythonOlder,
+  pillow,
 }:
 
 buildPythonPackage rec {
@@ -20,6 +21,8 @@ buildPythonPackage rec {
     hash = "sha256-tiq8h6s2noWLBIOIWcj8jfSqJFN01ee2uoHN4aFwn7s=";
   };
 
+  dependencies = [ pillow ];
+
   checkPhase = ''
     ${python.interpreter} tests/test_icnsutil.py
     ${python.interpreter} tests/test_cli.py