diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index bb521e0..abb0a31 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -28,7 +28,7 @@ if(MSVC)
 endif(MSVC)
 set(Boost_THREAD_FOUND              OFF)
 find_package(Boost COMPONENTS system thread filesystem)
-include_directories (${Boost_INCLUDE_DIRS})
+include_directories (${Boost_INCLUDE_DIRS} ${PROJECT_SOURCE_DIR}/include ${PROJECT_SOURCE_DIR}/tools/epanet-output/include)
 
 
 #I like to keep test files in a separate source directory called test