diff --git a/cfitsio.pc.cmake b/cfitsio.pc.cmake
index 949b80e..6ffcaa6 100644
--- a/cfitsio.pc.cmake
+++ b/cfitsio.pc.cmake
@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=${prefix}
-libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+libdir="@CMAKE_INSTALL_FULL_LIBDIR@"
+includedir="@CMAKE_INSTALL_FULL_INCLUDEDIR@"
 
 Name: cfitsio
 Description: FITS File Subroutine Library