diff --git a/process_event b/process_event
index 9c15651..379a8b2 100644
--- a/process_event
+++ b/process_event
@@ -329,7 +329,7 @@ function process_event
                 local end_msg="e.g. ${server_nick_current}: what is ${factoids[0]} (or ,${factoids[0]})"
 
                 send_msg "${personoslash}" "${begin_msg}"
-                for (( factoid_n = 0 ; factoid_n < n_factoids ; factoid_n = factoid_n      10 ))
+		for (( factoid_n = 0 ; factoid_n < n_factoids ; factoid_n = factoid_n + 10 ))
                 do  send_msg "${personoslash}" "    ${factoids[*]:${factoid_n}:10}"
                     sleep 1
                 done