diff --git a/CMakeLists.txt b/CMakeLists.txt
index 988dbf8f..ec812eab 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -266,7 +266,7 @@ endif()
 if(ENABLE_RTI)
     find_package(PkgConfig)
     if(PKG_CONFIG_FOUND)
-      SET(ENV{PKG_CONFIG_PATH} "${CMAKE_INSTALL_PREFIX}/lib/pkgconfig:$ENV{PKG_CONFIG_PATH}")
+      SET(ENV{PKG_CONFIG_PATH} "${CMAKE_INSTALL_PREFIX}/${_LIBDIR_DEFAULT}/pkgconfig:$ENV{PKG_CONFIG_PATH}")
       pkg_check_modules(RTI hla-rti13)
     endif(PKG_CONFIG_FOUND)
     if(RTI_FOUND)