diff --git a/source/org/jivesoftware/smack/util/StringUtils.java b/source/org/jivesoftware/smack/util/StringUtils.java
index 1dfd6a357..d9d8192a2 100644
--- a/source/org/jivesoftware/smack/util/StringUtils.java
+++ b/source/org/jivesoftware/smack/util/StringUtils.java
@@ -361,4 +361,8 @@ public class StringUtils {
         }
         return new String(randBuffer);
     }
+
+    private StringUtils() {
+        // Not instantiable.
+    }
 }