diff --git a/schema/versions/mysql/53.sql b/schema/versions/mysql/53.sql
index cd96853c1..345d968c6 100644
--- a/schema/versions/mysql/53.sql
+++ b/schema/versions/mysql/53.sql
@@ -1,11 +1,11 @@
 alter table ttrss_labels2 add column fg_color varchar(15);
 update ttrss_labels2 set fg_color = '';
 alter table ttrss_labels2 change fg_color fg_color varchar(15) not null;
-alter table ttrss_labels2 change fg_color fg_color varchar(15) not default '';
+alter table ttrss_labels2 change fg_color fg_color varchar(15) set default '';
 
 alter table ttrss_labels2 add column bg_color varchar(15);
 update ttrss_labels2 set bg_color = '';
 alter table ttrss_labels2 change bg_color bg_color varchar(15) not null;
-alter table ttrss_labels2 change fg_color bg_color varchar(15) not default '';
+alter table ttrss_labels2 change fg_color bg_color varchar(15) set default '';
 
 update ttrss_version set schema_version = 53;