diff --git a/src/main/java/com/google/devtools/build/lib/cmdline/Label.java b/src/main/java/com/google/devtools/build/lib/cmdline/Label.java
index 16d4e80..c067736 100644
--- a/src/main/java/com/google/devtools/build/lib/cmdline/Label.java
+++ b/src/main/java/com/google/devtools/build/lib/cmdline/Label.java
@@ -628,6 +628,9 @@
   /** Two labels are equal iff both their name and their package name are equal. */
   @Override
   public boolean equals(Object other) {
+    if (this == other) {
+      return true;
+    }
     if (!(other instanceof Label)) {
       return false;
     }