diff --git a/CMakeLists.txt b/CMakeLists.txt
index 23311d8c..9d3ac070 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -439,8 +439,8 @@ if(NOT THIS_IS_SUBPROJECT)
   set(prefix_save "${PREFIX}")
   set(prefix "${CMAKE_INSTALL_PREFIX}")
   set(exec_prefix "\${prefix}")
-  set(libdir "\${exec_prefix}/lib")
-  set(includedir "\${prefix}/include")
+  set(libdir ${CMAKE_INSTALL_FULL_LIBDIR})
+  set(includedir ${CMAKE_INSTALL_FULL_INCLUDEDIR})
   set(VERSION "${PROJECT_VERSION}")
 
   if (HAVE_SUBUNIT)