diff --git a/tests/src/fsfw_tests/unit/CMakeLists.txt b/tests/src/fsfw_tests/unit/CMakeLists.txt
index 01e4d19c..a0712ee1 100644
--- a/tests/src/fsfw_tests/unit/CMakeLists.txt
+++ b/tests/src/fsfw_tests/unit/CMakeLists.txt
@@ -1,3 +1,9 @@
+if(NOT TARGET_NAME)
+    message(WARNING
+        "TARGET_NAME needs to be defined because the Catch2 sources will be added to it"
+    )
+endif()
+
 target_sources(${TARGET_NAME} PRIVATE
     CatchDefinitions.cpp
     CatchFactory.cpp