diff --git a/oap-server/oal-rt/src/main/resources/code-templates/metrics/getMeta.ftl b/oap-server/oal-rt/src/main/resources/code-templates/metrics/getMeta.ftl
index 37034a15e..83a62a62d 100644
--- a/oap-server/oal-rt/src/main/resources/code-templates/metrics/getMeta.ftl
+++ b/oap-server/oal-rt/src/main/resources/code-templates/metrics/getMeta.ftl
@@ -1,3 +1,3 @@
 public org.apache.skywalking.oap.server.core.analysis.metrics.MetricsMetaInfo getMeta() {
-return new org.apache.skywalking.oap.server.core.analysis.metrics.MetricsMetaInfo("${varName}", ${sourceScopeId}<#if (fieldsFromSource?size>0) ><#list fieldsFromSource as field><#if field.isID()>, ${field.fieldName}</#if></#list></#if>);
+return new org.apache.skywalking.oap.server.core.analysis.metrics.MetricsMetaInfo("${varName}", ${sourceScopeId?c}<#if (fieldsFromSource?size>0) ><#list fieldsFromSource as field><#if field.isID()>, ${field.fieldName}</#if></#list></#if>);
 }
\ No newline at end of file