diff --git a/src/did/+did/+file/fileobj.m b/src/did/+did/+file/fileobj.m
index 0158b7b..5ee710e 100644
--- a/src/did/+did/+file/fileobj.m
+++ b/src/did/+did/+file/fileobj.m
@@ -207,7 +207,7 @@ function frewind(fileobj_obj)
             %
             % See also: FWRITE
 
-            if strcmpi(fileobj_obj.permission(1),'r')
+            if strcmpi(fileobj_obj.permission(1),'r') && ~contains(fileobj_obj.permission,'+')
                 error('DID:File:Fileobj','Cannot use fwrite() method with read-only file');
             end