diff --git a/data.c b/data.c
index 525b1e9..1cb00dd 100644
--- a/data.c
+++ b/data.c
@@ -1034,7 +1034,7 @@ d_char *following_list(snac *snac)
 d_char *_muted_fn(snac *snac, char *actor)
 {
     xs *md5 = xs_md5_hex(actor, strlen(actor));
-    return xs_fmt("%s/muted/%s.json", snac->basedir, md5);
+    return xs_fmt("%s/muted/%s", snac->basedir, md5);
 }
 
 
diff --git a/upgrade.c b/upgrade.c
index 2473803..13f3fa1 100644
--- a/upgrade.c
+++ b/upgrade.c
@@ -84,9 +84,22 @@ int db_upgrade(d_char **error)
                 snac snac;
 
                 if (user_open(&snac, v)) {
+                    char *p, *v;
                     xs *dir = xs_fmt("%s/hidden", snac.basedir);
 
+                    /* create the hidden directory */
                     mkdir(dir, 0755);
+
+                    /* rename all muted files incorrectly named .json */
+                    xs *spec = xs_fmt("%s/muted/" "*.json", snac.basedir);
+                    xs *fns  = xs_glob(spec, 0, 0);
+
+                    p = fns;
+                    while (xs_list_iter(&p, &v)) {
+                        xs *nfn = xs_replace(v, ".json", "");
+                        rename(v, nfn);
+                    }
+
                     user_free(&snac);
                 }
             }