diff --git a/CMakeLists.txt b/CMakeLists.txt
index 14b6d2219..03d76d8b8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,8 +30,16 @@ LIST (APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
 include(GNUInstallDirs)
 SET (prefix ${CMAKE_INSTALL_PREFIX})
 SET (exec_prefix ${CMAKE_INSTALL_PREFIX})
-SET (libdir ${CMAKE_INSTALL_LIBDIR})
-SET (includedir ${CMAKE_INSTALL_INCLUDEDIR})
+IF (IS_ABSOLUTE ${CMAKE_INSTALL_LIBDIR})
+    SET (libdir ${CMAKE_INSTALL_LIBDIR})
+ELSE ()
+    SET (libdir "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
+ENDIF ()
+IF (IS_ABSOLUTE ${CMAKE_INSTALL_INCLUDEDIR})
+    SET (includedir ${CMAKE_INSTALL_INCLUDEDIR})
+ELSE ()
+    SET (includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+ENDIF ()
 
 OPTION (MSGPACK_32BIT "32bit compile" OFF)
 
diff --git a/msgpack-c.pc.in b/msgpack-c.pc.in
index 14806b7b4..208066252 100644
--- a/msgpack-c.pc.in
+++ b/msgpack-c.pc.in
@@ -1,7 +1,7 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
-libdir=${prefix}/@libdir@
-includedir=${prefix}/@includedir@
+libdir=@libdir@
+includedir=@includedir@
 
 Name: MessagePack
 Description: Binary-based efficient object serialization library