diff --git a/blscurve.nimble b/blscurve.nimble
index d5a3f7a..9ece53d 100644
--- a/blscurve.nimble
+++ b/blscurve.nimble
@@ -30,6 +30,8 @@ proc build(args, path: string) =
 
 proc run(args, path: string) =
   build args & " -r", path
+  if (NimMajor, NimMinor) > (1, 6):
+    build args & " --mm:refc -r", path
 
 ### tasks
 task test, "Run all tests":