diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectLoader.java b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectLoader.java
index e19bfc4fb..e8a125d57 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectLoader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/lib/ObjectLoader.java
@@ -166,6 +166,7 @@ public void copyTo(OutputStream out) throws MissingObjectException,
 		if (isLarge()) {
 			ObjectStream in = openStream();
 			try {
+				final long sz = in.getSize();
 				byte[] tmp = new byte[1024];
 				long copied = 0;
 				for (;;) {
@@ -175,7 +176,7 @@ public void copyTo(OutputStream out) throws MissingObjectException,
 					out.write(tmp, 0, n);
 					copied += n;
 				}
-				if (copied != getSize())
+				if (copied != sz)
 					throw new EOFException();
 			} finally {
 				in.close();