diff --git a/acinclude.m4 b/acinclude.m4
index 2b01d35489..6f81d51268 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -269,6 +269,9 @@ else
 		powerpc-apple-darwin5.4*)
 			AFS_SYSNAME="ppc_darwin_14"
 			;;
+		powerpc-apple-darwin5.5*)
+			AFS_SYSNAME="ppc_darwin_14"
+			;;
 		sparc-sun-solaris2.5*)
 			AFS_SYSNAME="sun4x_55"
 			;;