diff --git a/pkgs/development/python-modules/vapoursynth/default.nix b/pkgs/development/python-modules/vapoursynth/default.nix
index 1fb1d4be03ef..8e50bba69a4d 100644
--- a/pkgs/development/python-modules/vapoursynth/default.nix
+++ b/pkgs/development/python-modules/vapoursynth/default.nix
@@ -20,7 +20,7 @@ buildPythonPackage {
 
   unittestFlagsArray = [
     "-s"
-    "$src/test"
+    "test"
     "-p"
     "'*test.py'"
   ];