diff --git a/CMakeLists.txt b/CMakeLists.txt
index f2d98806..eab3086c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -268,7 +268,7 @@ endif()
 
 set(CONFIGURATION_FILES_DIR ${CMAKE_INSTALL_SYSCONFDIR})
 
-add_definitions(-DCONFIGURATION_FILES_DIR="${CMAKE_INSTALL_PREFIX}/${CONFIGURATION_FILES_DIR}")
+add_definitions(-DCONFIGURATION_FILES_DIR="${CONFIGURATION_FILES_DIR}")
 
 add_subdirectory(cmake)