diff --git a/mysql-test/include/mtr_warnings.sql b/mysql-test/include/mtr_warnings.sql
index bf0a58788d6..f793ff54e86 100644
--- a/mysql-test/include/mtr_warnings.sql
+++ b/mysql-test/include/mtr_warnings.sql
@@ -16,6 +16,12 @@ CREATE TABLE test_suppressions (
 -- no invalid patterns can be inserted
 -- into test_suppressions
 --
+SET @character_set_client_saved = @@character_set_client||
+SET @character_set_results_saved = @@character_set_results||
+SET @collation_connection_saved = @@collation_connection||
+SET @@character_set_client = latin1||
+SET @@character_set_results = latin1||
+SET @@collation_connection = latin1_swedish_ci||
 /*!50002
 CREATE DEFINER=root@localhost TRIGGER ts_insert
 BEFORE INSERT ON test_suppressions
@@ -24,6 +30,9 @@ FOR EACH ROW BEGIN
   SELECT "" REGEXP NEW.pattern INTO dummy;
 END
 */||
+SET @@character_set_client = @character_set_client_saved||
+SET @@character_set_results = @character_set_results_saved||
+SET @@collation_connection = @collation_connection_saved||
 
 
 --
@@ -38,6 +47,12 @@ CREATE TABLE global_suppressions (
 -- no invalid patterns can be inserted
 -- into global_suppressions
 --
+SET @character_set_client_saved = @@character_set_client||
+SET @character_set_results_saved = @@character_set_results||
+SET @collation_connection_saved = @@collation_connection||
+SET @@character_set_client = latin1||
+SET @@character_set_results = latin1||
+SET @@collation_connection = latin1_swedish_ci||
 /*!50002
 CREATE DEFINER=root@localhost TRIGGER gs_insert
 BEFORE INSERT ON global_suppressions
@@ -46,6 +61,9 @@ FOR EACH ROW BEGIN
   SELECT "" REGEXP NEW.pattern INTO dummy;
 END
 */||
+SET @@character_set_client = @character_set_client_saved||
+SET @@character_set_results = @character_set_results_saved||
+SET @@collation_connection = @collation_connection_saved||