diff --git a/src/ast/bv_decl_plugin.cpp b/src/ast/bv_decl_plugin.cpp
index 37b339ddb..d01b8371b 100644
--- a/src/ast/bv_decl_plugin.cpp
+++ b/src/ast/bv_decl_plugin.cpp
@@ -566,6 +566,7 @@ func_decl * bv_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters, p
 
 func_decl * bv_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters, parameter const * parameters, 
                                          unsigned num_args, expr * const * args, sort * range) {
+    ast_manager& m = *m_manager;
     int bv_size;
     if (k == OP_INT2BV && get_int2bv_size(num_parameters, parameters, bv_size)) {
         // bv_size is filled in.
@@ -589,7 +590,7 @@ func_decl * bv_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters, p
         return decl_plugin::mk_func_decl(k, num_parameters, parameters, num_args, args, range);
     }
     else if (num_args == 0 || !get_bv_size(args[0], bv_size)) {
-        m_manager->raise_exception("operator is applied to arguments of the wrong sort");
+        m.raise_exception("operator is applied to arguments of the wrong sort");
         return 0;
     }
     func_decl * r = mk_func_decl(k, bv_size);