diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackFile.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackFile.java
index 2ca9e83f1..cbf745213 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackFile.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackFile.java
@@ -643,9 +643,10 @@ public class PackFile implements Iterable<PackIndex.MutableEntry> {
 	}
 
 	private void doOpen() throws IOException {
+		if (invalid) {
+			throw new PackInvalidException(packFile);
+		}
 		try {
-			if (invalid)
-				throw new PackInvalidException(packFile);
 			synchronized (readLock) {
 				fd = new RandomAccessFile(packFile, "r"); //$NON-NLS-1$
 				length = fd.length();