diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index 24157d428..5ba9504ed 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -1824,7 +1824,6 @@ ast * ast_manager::register_node_core(ast * n) {
     }
 
     n->m_id = is_decl(n) ? m_decl_id_gen.mk() : m_expr_id_gen.mk();
-
     TRACE("ast", tout << "Object " << n->m_id << " was created.\n";);
     TRACE("mk_var_bug", tout << "mk_ast: " << n->m_id << "\n";);
     // increment reference counters
diff --git a/src/smt/theory_seq.cpp b/src/smt/theory_seq.cpp
index a62351edf..216b0f1d4 100644
--- a/src/smt/theory_seq.cpp
+++ b/src/smt/theory_seq.cpp
@@ -1874,7 +1874,9 @@ bool theory_seq::propagate_length_coherence(expr* e) {
     elems.push_back(seq);
     tail = mk_concat(elems.size(), elems.c_ptr());
     // len(e) >= low => e = tail;
-    literal low(mk_literal(m_autil.mk_ge(mk_len(e), m_autil.mk_numeral(lo, true))));
+    expr_ref lo_e(m_autil.mk_numeral(lo, true), m);
+    expr_ref len_e_ge_lo(m_autil.mk_ge(mk_len(e), lo_e), m);
+    literal low = mk_literal(len_e_ge_lo);
     add_axiom(~low, mk_seq_eq(e, tail));
     expr_ref len_e = mk_len(e);
     if (upper_bound(len_e, hi)) {