diff --git a/tests/util/CMakeLists.txt b/tests/util/CMakeLists.txt
index 425c27d..365c874 100644
--- a/tests/util/CMakeLists.txt
+++ b/tests/util/CMakeLists.txt
@@ -69,4 +69,4 @@ endif()
 enable_testing()
 
 include(AddClarTest)
-add_clar_test(util_tests util -v)
+add_clar_test(util_tests util -v -sftruncate)