diff --git a/roles/nagios_server/files/irc-colorize.py b/roles/nagios_server/files/irc-colorize.py
index 122f8d0f93..3de3d8ec02 100755
--- a/roles/nagios_server/files/irc-colorize.py
+++ b/roles/nagios_server/files/irc-colorize.py
@@ -29,6 +29,7 @@ mirc_colors = {
 mapping = {
     'RECOVERY': 'green',
     'OK': 'green',
+    'ACKNOWLEDGEMENT', 'yellow',
     'UNKNOWN': 'purple',
     'WARNING': 'teal',
     # 'red' probably makes the most sense here, but it behaved oddly