diff --git a/acinclude.m4 b/acinclude.m4
index 3d5c068ddf..aed68b0666 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -346,6 +346,9 @@ else
 		hppa*-hp-hpux11.11)
 			AFS_SYSNAME="hp_ux11i"
 			;;
+		hppa*-hp-hpux11.23)
+			AFS_SYSNAME="hp_ux1123"
+			;;
 		ia64-hp-hpux11.22)
 			AFS_SYSNAME="ia64_hpux1122"
 			;;