diff --git a/howdy/src/pam/meson.build b/howdy/src/pam/meson.build
index fa04f7b..80ffd82 100644
--- a/howdy/src/pam/meson.build
+++ b/howdy/src/pam/meson.build
@@ -14,7 +14,7 @@ paths_h = configure_file(
 	install_dir: get_option('pam_dir')
 )
 
-pamdir = get_option('pam_dir') != '' ? get_option('pam_dir') : join_paths(get_option('libdir'), 'security')
+pamdir = get_option('pam_dir') != '' ? get_option('pam_dir') : join_paths(get_option('prefix'), get_option('libdir'), 'security')
 
 shared_library(
 	'pam_howdy',