diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/MetadataCache.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/MetadataCache.java
index ad6a6c7..8443086 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/MetadataCache.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/MetadataCache.java
@@ -47,7 +47,7 @@
 public class MetadataCache {
 
     // Default life time period of a temp dataset. It is 30 days.
-    private final static long TEMP_DATASET_INACTIVE_TIME_THRESHOLD = 3600 * 24 * 30 * 1000;
+    private final static long TEMP_DATASET_INACTIVE_TIME_THRESHOLD = 3600 * 24 * 30 * 1000L;
     // Key is dataverse name.
     protected final Map<String, Dataverse> dataverses = new HashMap<String, Dataverse>();
     // Key is dataverse name. Key of value map is dataset name.