diff --git a/test/conv/dune b/test/conv/dune
index 0d9e9ee..f8a0888 100644
--- a/test/conv/dune
+++ b/test/conv/dune
@@ -5,5 +5,6 @@
 
 (rule
  (alias runtest)
+ (enabled_if (= ${os_type} "Unix"))
  (action
   (run ./test_conv.exe --color=always)))