diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 14bbaa1..d199bca 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -461,7 +461,8 @@
 			break;
 		default:
 			printk(KERN_WARNING PREFIX
-				"Unknown DMAR structure type\n");
+				"Unknown DMAR structure type %d\n",
+				entry_header->type);
 			ret = 0; /* for forward compatibility */
 			break;
 		}