diff --git a/repo/repo-sql-impl/src/main/java/com/evolveum/midpoint/repo/sql/SqlRepositoryConfiguration.java b/repo/repo-sql-impl/src/main/java/com/evolveum/midpoint/repo/sql/SqlRepositoryConfiguration.java
index 0e274394c76..01782f36f7f 100644
--- a/repo/repo-sql-impl/src/main/java/com/evolveum/midpoint/repo/sql/SqlRepositoryConfiguration.java
+++ b/repo/repo-sql-impl/src/main/java/com/evolveum/midpoint/repo/sql/SqlRepositoryConfiguration.java
@@ -407,7 +407,7 @@ private void computeDefaultConcurrencyParameters() {
             defaultLockForUpdateViaSql = false;
             defaultUseReadOnlyTransactions = false;        // h2 does not support "SET TRANSACTION READ ONLY" command
         } else if (isUsingMySqlCompatible()) {
-	        defaultTransactionIsolation = TransactionIsolation.SERIALIZABLE;
+	        defaultTransactionIsolation = TransactionIsolation.REPEATABLE_READ;
 	        defaultLockForUpdateViaHibernate = false;
 	        defaultLockForUpdateViaSql = true;
 	        defaultUseReadOnlyTransactions = true;