diff --git a/utils/misc/src/main/java/org/onlab/util/Tools.java b/utils/misc/src/main/java/org/onlab/util/Tools.java
index 0989010..bf9bea0 100644
--- a/utils/misc/src/main/java/org/onlab/util/Tools.java
+++ b/utils/misc/src/main/java/org/onlab/util/Tools.java
@@ -162,7 +162,7 @@
      * @param collection collection to test
      * @return true if null or empty; false otherwise
      */
-    public static boolean isNullOrEmpty(Collection collection) {
+    public static boolean isNullOrEmpty(Collection<?> collection) {
         return collection == null || collection.isEmpty();
     }