diff --git a/msgpack-c.pc.in b/msgpack-c.pc.in
index 20806625..14806b7b 100644
--- a/msgpack-c.pc.in
+++ b/msgpack-c.pc.in
@@ -1,7 +1,7 @@
 prefix=@prefix@
 exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@
+libdir=${prefix}/@libdir@
+includedir=${prefix}/@includedir@
 
 Name: MessagePack
 Description: Binary-based efficient object serialization library