diff --git a/db_scripts/diff/15220.down b/db_scripts/diff/15220.down
new file mode 100644
index 00000000..5655b685
--- /dev/null
+++ b/db_scripts/diff/15220.down
@@ -0,0 +1,2 @@
+use kamailio;
+alter table usr_preferences drop key av_idx;
diff --git a/db_scripts/diff/15220.up b/db_scripts/diff/15220.up
new file mode 100644
index 00000000..df9fdf2b
--- /dev/null
+++ b/db_scripts/diff/15220.up
@@ -0,0 +1,2 @@
+use kamailio;
+alter table usr_preferences add key av_idx(attribute, value);