diff --git a/pkgs/tools/misc/vdirsyncer/default.nix b/pkgs/tools/misc/vdirsyncer/default.nix
index cd4297103ec..603492718d0 100644
--- a/pkgs/tools/misc/vdirsyncer/default.nix
+++ b/pkgs/tools/misc/vdirsyncer/default.nix
@@ -68,7 +68,6 @@ python3Packages.buildPythonApplication rec {
 
   checkPhase = ''
     rm -rf vdirsyncer
-    export PYTHONPATH=$out/${python3Packages.python.sitePackages}:$PYTHONPATH
     make DETERMINISTIC_TESTS=true test
   '';