diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index dae0332..851cc0c 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -4,7 +4,7 @@ project(erc-test)
 
 set(CMAKE_BUILD_TYPE Debug)
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DHEADLESS")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DHEADLESS -DTESTING")
 
 if(DEFINED ENV{STATIC_ANALYSIS})
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} --analyze")