diff --git a/src/taoensso/timbre.clj b/src/taoensso/timbre.clj
index 17b483b..f28b13b 100644
--- a/src/taoensso/timbre.clj
+++ b/src/taoensso/timbre.clj
@@ -132,10 +132,18 @@
 (defn- wrap-appender-fn
   "Wraps compile-time appender fn with additional runtime capabilities
   controlled by compile-time config."
-  [{apfn :fn :keys [async? max-message-per-msecs] :as appender}]
+  [{apfn :fn :keys [async? max-message-per-msecs prefix-fn] :as appender}]
   (->> ; Wrapping applies capabilities bottom-to-top
    apfn
 
+   ;; Wrap for per-appender prefix-fn support
+   ((fn [apfn]
+      (if-not prefix-fn
+        apfn
+        (fn [apfn-args]
+          (apfn (assoc apfn-args
+                  :prefix (prefix-fn apfn-args)))))))
+
    ;; Wrap for runtime flood-safety support
    ((fn [apfn]
       (if-not max-message-per-msecs
@@ -407,4 +415,4 @@
             (if (contains? message :password)
               (assoc args :message (assoc message :password "*****"))
               args)
-            :else args))]))
\ No newline at end of file
+            :else args))]))
diff --git a/src/taoensso/timbre/appenders/irc.clj b/src/taoensso/timbre/appenders/irc.clj
index a50b704..873952b 100644
--- a/src/taoensso/timbre/appenders/irc.clj
+++ b/src/taoensso/timbre/appenders/irc.clj
@@ -32,9 +32,7 @@
   (when-let [irc-config (:irc ap-config)]
     (send-message
      (assoc irc-config
-       :prefix (if-let [prefix-fn (:prefix-fn irc-config)]
-                 (prefix-fn prefix)
-                 prefix)
+       :prefix prefix
        :message message))))
 
 (def irc-appender
@@ -44,4 +42,5 @@
               :name \"My Logger\" :chan \"#logs\"")
    :min-level :info :enabled? true :async? false
    :max-message-per-msecs nil ; no rate limit by default
+   :prefix-fn (fn [{:keys [level]}] (-> level name str/upper-case))
    :fn appender-fn})