diff --git a/m4/prereq.m4 b/m4/prereq.m4
index 205382a19..45e3efcf4 100644
--- a/m4/prereq.m4
+++ b/m4/prereq.m4
@@ -1,4 +1,4 @@
-#serial 15
+#serial 16
 
 dnl These are the prerequisite macros for files in the lib/
 dnl directories of the fileutils, sh-utils, and textutils packages.