diff --git a/dbmigration/source/java/ch/systemsx/cisd/dbmigration/BasicDataSourceFactory.java b/dbmigration/source/java/ch/systemsx/cisd/dbmigration/BasicDataSourceFactory.java
index 0e9135dd2b17aa4865fdb045aa936f21fb2a3ed1..9d1142ea947590609b217fe8fcbe51f953a3bd5d 100644
--- a/dbmigration/source/java/ch/systemsx/cisd/dbmigration/BasicDataSourceFactory.java
+++ b/dbmigration/source/java/ch/systemsx/cisd/dbmigration/BasicDataSourceFactory.java
@@ -55,6 +55,7 @@ public class BasicDataSourceFactory implements IDataSourceFactory
         dataSource.setMaxIdle(maxIdle);
         dataSource.setMaxActive(maxActive);
         dataSource.setMaxWait(maxWait);
+        dataSource.setValidationQuery("SELECT 1");
         return dataSource;
     }