diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 366ce6fe..c9ffbac4 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -10,7 +10,7 @@ get_filename_component(ROOT_DIR "${CMAKE_SOURCE_DIR}" REALPATH)
 
 # test directories that can be adjusted
 if(NOT NP2_TEST_ROOT_DIR)
-    set(NP2_TEST_ROOT_DIR @CMAKE_CURRENT_BINARY_DIR@/repositories)
+    set(NP2_TEST_ROOT_DIR ${CMAKE_CURRENT_BINARY_DIR}/repositories)
 endif()
 if(NOT NP2_TEST_MODULE_DIR)
     set(NP2_TEST_MODULE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/modules)