diff --git a/src/resp2/test/dune b/src/resp2/test/dune
index 933db654..b2ace9d3 100644
--- a/src/resp2/test/dune
+++ b/src/resp2/test/dune
@@ -1,3 +1,4 @@
 (tests
   (names t)
+  (locks /ctest)
   (libraries qcheck containers containers.resp2 threads unix))