diff --git a/src/db_query.c b/src/db_query.c
index 30caab2..e801229 100644
--- a/src/db_query.c
+++ b/src/db_query.c
@@ -323,7 +323,7 @@ int64_t updateQuery(struct stored_conn_t *sconn,
 
   strbld_str(sb, "UPDATE ", 7);
   escapeTableName_sb(sb, table, table_len);
-  strbld_str(sb, " SET ", 4);
+  strbld_str(sb, " SET ", 5);
   strbld_str(sb, set, set_len);
   compileWhereBuilder_sb(sb, wb, 1);