diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index b2ca162..8322351 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -96,3 +96,5 @@
 add_subdirectory(style)
 add_subdirectory(utests)
 add_subdirectory(fuzz)
+
+set(format_sources ${format_sources} PARENT_SCOPE)