diff --git a/xml/queries.xml b/xml/queries.xml
index 79add0fb7..0910c03b8 100644
--- a/xml/queries.xml
+++ b/xml/queries.xml
@@ -97,7 +97,7 @@
         <timedelay query="SELECT PG_SLEEP(%d)" query2="SELECT 'sqlmap' WHERE exists(SELECT * FROM generate_series(1,300000%d))" query3="CREATE OR REPLACE FUNCTION sleep(int) RETURNS int AS '/lib/libc.so.6','sleep' language 'C' STRICT; SELECT sleep(%d)"/>
         <substring query="SUBSTR((%s)::text,%d,%d)"/>
         <case query="SELECT (CASE WHEN (%s) THEN '1' ELSE '0' END)"/>
-        <hex query="ENCODE(%s,HEX)"/>
+        <hex query="ENCODE(CONVERT_TO((%s), 'UTF8'),'HEX')"/>
         <inference query="ASCII(SUBSTR((%s)::text,%d,1)) > %d"/>
         <banner query="VERSION()"/>
         <current_user query="CURRENT_USER"/>