--- a/RapidJSON.pc.in
+++ b/RapidJSON.pc.in
@@ -1,4 +1,5 @@
-includedir=@INCLUDE_INSTALL_DIR@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=${prefix}/include
 
 Name: @PROJECT_NAME@
 Description: A fast JSON parser/generator for C++ with both SAX/DOM style API
