diff --git a/src/db_value.c b/src/db_value.c
index 03914c8..b3e261c 100644
--- a/src/db_value.c
+++ b/src/db_value.c
@@ -71,7 +71,9 @@ void db_value_sbva(str_builder *sb, e_column_type type, uint32_t n_args, va_list
 
   if (type == TYPE_TIMESTAMP) {
     if (db_timestampString(va_arg(args, int64_t), &tmp_str, &tmp_len) != 0) {
+      strbld_char(sb, '\'');
       strbld_str(sb, tmp_str, tmp_len);
+      strbld_char(sb, '\'');
       free(tmp_str);
     }
     return;