diff --git a/olm.pc.in b/olm.pc.in
index 6f189bd..325c941 100644
--- a/olm.pc.in
+++ b/olm.pc.in
@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=${prefix}
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
-libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
 
 Name: olm
 Description: implementation of the Double Ratchet cryptographic ratchet in C++