diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 09a603d300..7bfca565de 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -12,9 +12,9 @@ foreach(DIR ${TEST_SUBDIRS})
     endif()							# own variable scope copied from this scope (the parent scope)).
 endforeach()
 
-file(GLOB SHARED_TEST_HEADER_FILES "${CMAKE_CURRENT_SOURCE_DIR}" "*.h" "*.hpp")
+file(GLOB SHARED_TEST_HEADER_FILES "${CMAKE_CURRENT_SOURCE_DIR}" "${CMAKE_CURRENT_SOURCE_DIR}/*.h" "${CMAKE_CURRENT_SOURCE_DIR}/*.hpp")
 
-add_custom_target("test-extensions" 
+add_custom_target("test-extensions"
 	SOURCES "${SHARED_TEST_HEADER_FILES}")
 list(APPEND ALL_TEST_TARGETS "test-extensions")
 set_target_properties("test-extensions" PROPERTIES FOLDER "Tests")