diff --git a/Library/OcAppleDiskImageLib/OcAppleDiskImageLib.c b/Library/OcAppleDiskImageLib/OcAppleDiskImageLib.c
index ccd504b8..5e30dea6 100644
--- a/Library/OcAppleDiskImageLib/OcAppleDiskImageLib.c
+++ b/Library/OcAppleDiskImageLib/OcAppleDiskImageLib.c
@@ -79,8 +79,10 @@ OcAppleDiskImageInitializeContext (
   if (!Result || (Trailer.Signature != SwappedSig)) {
     DEBUG ((
       DEBUG_INFO,
-      "Dmg trailer error: %d - %X/%X.\n",
+      "Dmg trailer error: %d - %Lx/%Lx - %X/%X.\n",
       Result,
+      (UINT64) TrailerOffset,
+      (UINT64) FileSize,
       SwappedSig,
       Trailer.Signature
       ));