diff --git a/tests/tnimlsp.nim b/tests/tnimlsp.nim
index 6dcab9b..9db11f9 100644
--- a/tests/tnimlsp.nim
+++ b/tests/tnimlsp.nim
@@ -4,7 +4,7 @@ include .. / src / nimlsppkg / messages
 import pkg/asynctools
 
 let
-  nimlsp = parentDir(parentDir(currentSourcePath())) / "nimlsp"
+  nimlsp = parentDir(parentDir(currentSourcePath())) / "nimlsp".addFileExt(ExeExt)
   p = startProcess(nimlsp, options = {})
 
 suite "Nim LSP basic operation":