diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index afc4633..7c05d71 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,5 +1,6 @@
 # (C) British Crown Copyright 2024 Met Office
 
 add_subdirectory(nemo-feedback)
-add_subdirectory(tests)
-
+if(BUILD_TESTING)
+  add_subdirectory(tests)
+endif()