diff --git a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/S3Repository.java b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/S3Repository.java
index 3c98d7b9e..5ebce5d8c 100644
--- a/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/S3Repository.java
+++ b/org.eclipse.jgit.lfs.server/src/org/eclipse/jgit/lfs/server/s3/S3Repository.java
@@ -126,7 +126,7 @@ public long getSize(AnyLongObjectId oid) throws IOException {
 			String contentLengthHeader = conn
 					.getHeaderField(HDR_CONTENT_LENGTH);
 			if (contentLengthHeader != null) {
-				return Integer.parseInt(contentLengthHeader);
+				return Long.parseLong(contentLengthHeader);
 			}
 		}
 		return -1;