diff --git a/mod/hotpot/db/postgres7.sql b/mod/hotpot/db/postgres7.sql
index b8d345596f6..094ce96e3ab 100644
--- a/mod/hotpot/db/postgres7.sql
+++ b/mod/hotpot/db/postgres7.sql
@@ -69,6 +69,7 @@ CREATE TABLE prefix_hotpot_questions (
 );
 COMMENT ON TABLE prefix_hotpot_questions IS 'details about questions in Hot Potatatoes quiz attempts';
 CREATE INDEX prefix_hotpot_questions_hotpot_idx ON prefix_hotpot_questions (hotpot);
+CREATE INDEX prefix_hotpot_questions_name_idx ON prefix_hotpot_questions (SUBSTR(name,20));
 #
 # Table structure for table `hotpot_responses`
 #
@@ -96,3 +97,4 @@ CREATE TABLE prefix_hotpot_strings (
   string TEXT NOT NULL
 );
 COMMENT ON TABLE prefix_hotpot_strings IS 'strings used in Hot Potatatoes questions and responses';
+CREATE INDEX prefix_hotpot_strings_string_idx ON prefix_hotpot_strings (SUBSTR(string,20));