diff --git a/0001-dbop_mysql-remove-extraneous-DEFAULT-keyword-in-clas.patch b/0001-dbop_mysql-remove-extraneous-DEFAULT-keyword-in-clas.patch
new file mode 100644
index 0000000..428c26b
--- /dev/null
+++ b/0001-dbop_mysql-remove-extraneous-DEFAULT-keyword-in-clas.patch
@@ -0,0 +1,28 @@
+From 6a53ab4e03588a26dcaf77c1948ac843c9366898 Mon Sep 17 00:00:00 2001
+From: Jan Engelhardt <jengelh@inai.de>
+Date: Sun, 16 Apr 2023 14:31:08 +0200
+Subject: [PATCH] dbop_mysql: remove extraneous DEFAULT keyword in "classes"
+ table CREATE statement
+
+Fixes: gromox-2.7-154-g7d7944f9d
+References: GXF-991
+---
+ lib/dbop_mysql.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git lib/dbop_mysql.cpp lib/dbop_mysql.cpp
+index 2a172a38d..ea091ed5c 100644
+--- lib/dbop_mysql.cpp
++++ lib/dbop_mysql.cpp
+@@ -428,7 +428,7 @@ static constexpr char tbl_classes_top[] =
+ "CREATE TABLE `classes` ("
+ "  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,"
+ "  `classname` varchar(128) NOT NULL,"
+-"  `listname` varchar(320) CHARACTER SET ascii DEFAULT NOT NULL,"
++"  `listname` varchar(320) CHARACTER SET ascii NOT NULL,"
+ "  `filters` TEXT,"
+ "  `domain_id` int(10) unsigned NOT NULL,"
+ "  PRIMARY KEY (`id`),"
+-- 
+2.40.0
+
diff --git a/gromox.changes b/gromox.changes
index 9302696..b28e932 100644
--- a/gromox.changes
+++ b/gromox.changes
@@ -11,6 +11,7 @@ Sat Apr 15 10:07:22 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
     OL/g-web) is no longer tied to visibility in the GAL.
   * Support for non-default stores in the IMAP and POP3 protocols;
     use "actualusername!sharedmbox" as the username for login.
+- Add 0001-dbop_mysql-remove-extraneous-DEFAULT-keyword-in-clas.patch
 
 -------------------------------------------------------------------
 Fri Mar 24 01:13:00 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
diff --git a/gromox.spec b/gromox.spec
index a0e551d..a8e14b5 100644
--- a/gromox.spec
+++ b/gromox.spec
@@ -28,6 +28,7 @@ URL:            https://grommunio.com/
 Source:         https://github.com/grommunio/gromox/releases/download/%name-%version/%name-%version.tar.zst
 Source2:        https://github.com/grommunio/gromox/releases/download/%name-%version/%name-%version.tar.asc
 Source8:        %name.keyring
+Patch1:         0001-dbop_mysql-remove-extraneous-DEFAULT-keyword-in-clas.patch
 BuildRequires:  automake >= 1.11
 BuildRequires:  fdupes
 BuildRequires:  gcc-c++
@@ -119,7 +120,7 @@ ready-to-run installation of Gromox.
 
 %build
 autoreconf -fi
-%configure CFLAGS="%optflags -Og" CXXFLAGS="%optflags -Og"
+%configure
 %make_build V=1
 
 %install