diff --git a/src/smt/fingerprints.cpp b/src/smt/fingerprints.cpp
index 4550d22b5..d41e01573 100644
--- a/src/smt/fingerprints.cpp
+++ b/src/smt/fingerprints.cpp
@@ -104,9 +104,7 @@ namespace smt {
             return true;
         for (unsigned i = 0; i < num_args; ++i)
             d->m_args[i] = d->m_args[i]->get_root();
-        if (m_set.contains(d))
-            return true;
-        return false;
+        return m_set.contains(d);
     }
     
     void fingerprint_set::reset() {
diff --git a/src/smt/smt_model_checker.cpp b/src/smt/smt_model_checker.cpp
index 0037bb3da..c23cfe01e 100644
--- a/src/smt/smt_model_checker.cpp
+++ b/src/smt/smt_model_checker.cpp
@@ -258,7 +258,6 @@ namespace smt {
                 svector<symbol> names;
                 for (unsigned i = 0; i < f->get_arity(); ++i) 
                     names.push_back(symbol(i));
-                defined_names dn(m);
                 body = replace_value_from_ctx(body);
                 body = m.mk_lambda(sorts.size(), sorts.data(), names.data(), body);
                 sk_term = body;
diff --git a/src/smt/smt_model_checker.h b/src/smt/smt_model_checker.h
index c816b3cc0..3a8e81639 100644
--- a/src/smt/smt_model_checker.h
+++ b/src/smt/smt_model_checker.h
@@ -23,7 +23,6 @@ Revision History:
 #include "util/obj_hashtable.h"
 #include "ast/ast.h"
 #include "ast/array_decl_plugin.h"
-#include "ast/normal_forms/defined_names.h"
 #include "params/qi_params.h"
 #include "params/smt_params.h"