diff --git a/pkgs/development/python-modules/icontract/default.nix b/pkgs/development/python-modules/icontract/default.nix
index 9ae20a1943d2..d5584869bc69 100644
--- a/pkgs/development/python-modules/icontract/default.nix
+++ b/pkgs/development/python-modules/icontract/default.nix
@@ -41,6 +41,9 @@ buildPythonPackage rec {
     asttokens
     typing-extensions
   ];
+  pythonRelaxDeps = [
+    "asttokens"
+  ];
 
   nativeCheckInputs = [
     astor