build.gradle in embulk-output-postgresql-0.7.12 vs build.gradle in embulk-output-postgresql-0.7.13

@@ -1,7 +1,8 @@
 dependencies {
     compile project(':embulk-output-jdbc')
 
     compile 'org.postgresql:postgresql:9.4-1205-jdbc41'
+    defaultJdbcDriver 'org.postgresql:postgresql:9.4-1205-jdbc41'
 
     testCompile project(':embulk-output-jdbc').sourceSets.test.output
 }