diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/WindowCache.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/WindowCache.java
index 81537dd46..1045de4b1 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/WindowCache.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/WindowCache.java
@@ -848,6 +848,7 @@ private static interface PageRef<T> {
 		 * Whether this is a strong reference.
 		 * @return {@code true} if this is a strong reference
 		 */
+		@SuppressWarnings("unused")
 		boolean isStrongRef();
 	}