diff --git a/src/api/c++/z3++.h b/src/api/c++/z3++.h
index bd20a86f9..40edf2fec 100644
--- a/src/api/c++/z3++.h
+++ b/src/api/c++/z3++.h
@@ -507,7 +507,6 @@ namespace z3 {
         ast(context & c):object(c), m_ast(0) {}
         ast(context & c, Z3_ast n):object(c), m_ast(n) { Z3_inc_ref(ctx(), m_ast); }
         ast(ast const & s) :object(s), m_ast(s.m_ast) { Z3_inc_ref(ctx(), m_ast); }
-        ast(ast && s) noexcept : object(std::forward<object>(s)), m_ast(s.m_ast) { s.m_ast = nullptr; }
         ~ast() { if (m_ast) Z3_dec_ref(*m_ctx, m_ast); }
         operator Z3_ast() const { return m_ast; }
         operator bool() const { return m_ast != 0; }