diff --git a/src/db.c b/src/db.c
index f3ed863..31c4ba5 100644
--- a/src/db.c
+++ b/src/db.c
@@ -299,7 +299,7 @@
 {
 	sqlite3_stmt *stmt;
 	int rc;
-	const char *update_stmt_sql = "ALTER TABLE subscriber ADD COLUMN imei VARCHAR(14) default NULL";
+	const char *update_stmt_sql = "ALTER TABLE subscriber ADD COLUMN imei VARCHAR(14)";
 	const char *set_schema_version_sql = "PRAGMA user_version = 2";
 
 	rc = sqlite3_prepare_v2(dbc->db, update_stmt_sql, -1, &stmt, NULL);