diff --git a/guava/src/com/google/common/collect/ImmutableSet.java b/guava/src/com/google/common/collect/ImmutableSet.java
index d28d9bae3139..0e50546ff217 100644
--- a/guava/src/com/google/common/collect/ImmutableSet.java
+++ b/guava/src/com/google/common/collect/ImmutableSet.java
@@ -189,8 +189,7 @@ public static <E> ImmutableSet<E> copyOf(Collection<? extends E> elements) {
       return copyOfEnumSet((EnumSet<?>) elements);
     }
 
-    int size = elements.size();
-    if (size == 0) {
+    if (elements.isEmpty()) {
       // We avoid allocating anything.
       return of();
     }