diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
index 3fab484f2..dbf8eb780 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
@@ -244,6 +244,7 @@ public GC(FileRepository repo) {
 	 *             parsed
 	 */
 	// TODO(ms): in 5.0 change signature and return Future<Collection<PackFile>>
+	@SuppressWarnings("FutureReturnValueIgnored")
 	public Collection<PackFile> gc() throws IOException, ParseException {
 		if (!background) {
 			return doGc();