diff --git a/tmpl/tunning.cnf b/tmpl/tunning.cnf
index d2edbec..ac990d5 100644
--- a/tmpl/tunning.cnf
+++ b/tmpl/tunning.cnf
@@ -15,7 +15,7 @@ query_cache_size = %%getVar('dbQueryCacheSize')
 
 tmp_table_size = %%dbTmpTableSize
 max_heap_table_size = %%dbTmpTableSize
-max_allowed_packet = %%dbMaxAllowedPacket
+max_allowed_packet = %%{dbMaxAllowedPacket}M
 
 %if %%dbEnableSlowQueryLogs == "oui"
 slow-query-log = 1