diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 75a5216..6c4f26c 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -10,6 +10,7 @@ add_subdirectory(simple_test)
 add_subdirectory(ADC)
 add_subdirectory(MockADC)
 add_subdirectory(load)
+add_subdirectory(zero_cross_detection)