diff --git a/client/src/fileutils.c b/client/src/fileutils.c
index 5cf6d6e34..1f413c2d8 100644
--- a/client/src/fileutils.c
+++ b/client/src/fileutils.c
@@ -1755,7 +1755,7 @@ int loadFileJSONex(const char *preferredName, void *data, size_t maxdatalen, siz
             sptr += len;
         }
 
-        *datalen = sptr;
+        *datalen = sizeof(iso15_tag_t);
         goto out;
     }