diff --git a/usr.bin/getconf/pathconf.gperf b/usr.bin/getconf/pathconf.gperf
--- a/usr.bin/getconf/pathconf.gperf
+++ b/usr.bin/getconf/pathconf.gperf
@@ -24,6 +24,7 @@
 ACL_NFS4, _PC_ACL_NFS4
 ACL_PATH_MAX, _PC_ACL_PATH_MAX
 CAP_PRESENT, _PC_CAP_PRESENT
+DEALLOC_PRESENT, _PC_DEALLOC_PRESENT
 FILESIZEBITS, _PC_FILESIZEBITS
 INF_PRESENT, _PC_INF_PRESENT
 LINK_MAX, _PC_LINK_MAX