diff --git a/lib/qdp_hdf5.cc b/lib/qdp_hdf5.cc
index 4254120a8..de2be225c 100644
--- a/lib/qdp_hdf5.cc
+++ b/lib/qdp_hdf5.cc
@@ -284,6 +284,8 @@ namespace QDP {
 				run++;
 			}
 		}
+		isprefetched=true;
+		
 		return EXIT_SUCCESS;
 	}