diff --git a/CMakeLists.txt b/CMakeLists.txt
index a847eda..eac046e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,8 +119,8 @@ configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.cmake ${CMAKE_CURRENT_BINARY
 
 
 set(prefix ${CMAKE_INSTALL_PREFIX})
-set(exec_prefix ${prefix}/${CMAKE_INSTALL_BINDIR})
-set(libdir ${prefix}/${CMAKE_INSTALL_LIBDIR})
+set(exec_prefix ${CMAKE_INSTALL_FULL_LIBEXECDIR})
+set(libdir ${CMAKE_INSTALL_FULL_LIBDIR})
 set(includedir ${prefix}/include)
 
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/belle-sip.pc.in ${CMAKE_CURRENT_BINARY_DIR}/belle-sip.pc)