diff --git a/unicorn/CMakeLists.txt b/unicorn/CMakeLists.txt
index c7ef4280..1d0c3989 100644
--- a/unicorn/CMakeLists.txt
+++ b/unicorn/CMakeLists.txt
@@ -10,7 +10,7 @@
  
  set_cmake_policies()
  set_lib_link_mode()
- setup_sysconfdir("$ENV{CORIOLIS_TOP}")
+ setup_sysconfdir("${CMAKE_INSTALL_PREFIX}")
  setup_boost(program_options filesystem python regex)
  
  find_package(LibXml2 REQUIRED)