diff --git a/src/libmdb/backend.c b/src/libmdb/backend.c
index 0581f16..5a7277b 100644
--- a/src/libmdb/backend.c
+++ b/src/libmdb/backend.c
@@ -71,8 +71,8 @@ static MdbBackendType mdb_oracle_types[] = {
 		MdbBackendType_STRUCT_ELEMENT("TIMESTAMP",0,0,0),
 		MdbBackendType_STRUCT_ELEMENT("BINARY",0,0,0),
 		MdbBackendType_STRUCT_ELEMENT("VARCHAR2",1,0,1),
-		MdbBackendType_STRUCT_ELEMENT("BLOB",1,0,1),
-		MdbBackendType_STRUCT_ELEMENT("CLOB",1,0,1),
+		MdbBackendType_STRUCT_ELEMENT("BLOB",0,0,0),
+		MdbBackendType_STRUCT_ELEMENT("CLOB",0,0,0),
 		MdbBackendType_STRUCT_ELEMENT("Oracle_Unknown 0x0d",0,0,0),
 		MdbBackendType_STRUCT_ELEMENT("Oracle_Unknown 0x0e",0,0,0),
 		MdbBackendType_STRUCT_ELEMENT("NUMBER",1,0,0),