diff --git a/src/Fable.Build/Test/Python.fs b/src/Fable.Build/Test/Python.fs
index f962293af0..f122b7c1b4 100644
--- a/src/Fable.Build/Test/Python.fs
+++ b/src/Fable.Build/Test/Python.fs
@@ -33,11 +33,11 @@ let handle (args: string list) =
                 CmdLine.empty
                 |> CmdLine.appendRaw "--watch"
                 |> CmdLine.appendRaw "--runWatch"
-                |> CmdLine.appendRaw "poetry run pytest -x"
+                |> CmdLine.appendRaw $"poetry run pytest {buildDir} -x"
             else
                 CmdLine.empty
                 |> CmdLine.appendRaw "--run"
-                |> CmdLine.appendRaw "poetry run pytest -x"
+                |> CmdLine.appendRaw $"poetry run pytest {buildDir} -x"
         ]
 
     if isWatch then