diff --git a/mxqadmin.c b/mxqadmin.c
index c4746f3..8b25ba5 100644
--- a/mxqadmin.c
+++ b/mxqadmin.c
@@ -369,7 +369,8 @@ int main(int argc, char *argv[])
     res = mx_mysql_initialize(&mysql);
     assert(res == 0);
 
-    mx_mysql_option_set_default_file(mysql, arg_mysql_default_file);
+    if (mx_mysql_option_set_default_file(mysql, arg_mysql_default_file) < 0)
+        mx_die("%s: %s\n", arg_mysql_default_file, mx_mysql_error());
     mx_mysql_option_set_default_group(mysql, arg_mysql_default_group);
 
     res = mx_mysql_connect_forever(&mysql);
diff --git a/mxqd.c b/mxqd.c
index 7079d27..30f2c3c 100644
--- a/mxqd.c
+++ b/mxqd.c
@@ -733,7 +733,8 @@ static int server_init(struct mxq_server *server, int argc, char *argv[])
     res = mx_mysql_initialize(&(server->mysql));
     assert(res == 0);
 
-    mx_mysql_option_set_default_file(server->mysql,  arg_mysql_default_file);
+    if (mx_mysql_option_set_default_file(server->mysql, arg_mysql_default_file) < 0)
+        mx_die("%s: %s\n", arg_mysql_default_file, mx_mysql_error());
     mx_mysql_option_set_default_group(server->mysql, arg_mysql_default_group);
     mx_mysql_option_set_reconnect(server->mysql, 1);
 
diff --git a/mxqdump.c b/mxqdump.c
index 0e69b06..5cb51b1 100644
--- a/mxqdump.c
+++ b/mxqdump.c
@@ -730,7 +730,8 @@ int main(int argc, char *argv[])
     res = mx_mysql_initialize(&mysql);
     assert(res == 0);
 
-    mx_mysql_option_set_default_file(mysql, arg_mysql_default_file);
+    if (mx_mysql_option_set_default_file(mysql, arg_mysql_default_file) < 0)
+        mx_die("%s: %s\n", arg_mysql_default_file, mx_mysql_error());
     mx_mysql_option_set_default_group(mysql, arg_mysql_default_group);
 
     res = mx_mysql_connect_forever(&mysql);
diff --git a/mxqkill.c b/mxqkill.c
index 4dbfd04..3b3ead3 100644
--- a/mxqkill.c
+++ b/mxqkill.c
@@ -374,7 +374,8 @@ int main(int argc, char *argv[])
     res = mx_mysql_initialize(&mysql);
     assert(res == 0);
 
-    mx_mysql_option_set_default_file(mysql, arg_mysql_default_file);
+    if (mx_mysql_option_set_default_file(mysql, arg_mysql_default_file) < 0)
+        mx_die("%s: %s\n", arg_mysql_default_file, mx_mysql_error());
     mx_mysql_option_set_default_group(mysql, arg_mysql_default_group);
 
     res = mx_mysql_connect_forever(&mysql);
diff --git a/mxqset.c b/mxqset.c
index 6a953af..3d4a24d 100644
--- a/mxqset.c
+++ b/mxqset.c
@@ -216,7 +216,8 @@ int main(int argc, char **argv) {
         exit_usage();
 
     assert(mx_mysql_initialize(&mysql) == 0);
-    mx_mysql_option_set_default_file(mysql, MXQ_MYSQL_DEFAULT_FILE);
+    if (mx_mysql_option_set_default_file(mysql, MXQ_MYSQL_DEFAULT_FILE) < 0)
+        mx_die("%s: %s\n", MXQ_MYSQL_DEFAULT_FILE, mx_mysql_error());
     mx_mysql_option_set_default_group(mysql, MXQ_MYSQL_DEFAULT_GROUP);
     assert(mx_mysql_connect_forever(&mysql) == 0);
 
diff --git a/mxqsub.c b/mxqsub.c
index b23c725..5ee8cee 100644
--- a/mxqsub.c
+++ b/mxqsub.c
@@ -1160,7 +1160,8 @@ int main(int argc, char *argv[])
     res = mx_mysql_initialize(&mysql);
     assert(res == 0);
 
-    mx_mysql_option_set_default_file(mysql, arg_mysql_default_file);
+    if (mx_mysql_option_set_default_file(mysql, arg_mysql_default_file) < 0)
+        mx_die("%s: %s\n", arg_mysql_default_file, mx_mysql_error());
     mx_mysql_option_set_default_group(mysql, arg_mysql_default_group);
 
     res = mx_mysql_connect_forever(&mysql);