diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3709073..8e919cb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -503,7 +503,7 @@ endif ()
 # ----------------------------------------------------------------------------
 # installation rules
 set (EXPORT_NAME ${PACKAGE_NAME}-targets)
-file (RELATIVE_PATH INSTALL_PREFIX_REL2CONFIG_DIR "${CMAKE_INSTALL_PREFIX}/${CONFIG_INSTALL_DIR}" "${CMAKE_INSTALL_PREFIX}")
+set (INSTALL_PREFIX_REL2CONFIG_DIR "../..")
 configure_file (cmake/config.cmake.in  "${PROJECT_BINARY_DIR}/${PACKAGE_NAME}-config-install.cmake" @ONLY)
 configure_file (cmake/version.cmake.in "${PROJECT_BINARY_DIR}/${PACKAGE_NAME}-config-version.cmake" @ONLY)