diff --git a/src/sat/smt/sls_solver.h b/src/sat/smt/sls_solver.h
index d14b403c9..35f4e1b7d 100644
--- a/src/sat/smt/sls_solver.h
+++ b/src/sat/smt/sls_solver.h
@@ -52,8 +52,6 @@ namespace sls {
 
 #else
 
-#include <thread>
-#include <mutex>
 #include "ast/sls/sls_smt_plugin.h"
 
 namespace euf {
diff --git a/src/test/dlist.cpp b/src/test/dlist.cpp
index 9ad04d6b2..e378ddec7 100644
--- a/src/test/dlist.cpp
+++ b/src/test/dlist.cpp
@@ -106,6 +106,7 @@ static void test_insert_before() {
     std::cout << "test_insert_before passed." << std::endl;
 }
 
+#if 0
 // Test the remove_from() method
 static void test_remove_from() {
     TestNode* list = nullptr;
@@ -119,6 +120,7 @@ static void test_remove_from() {
     SASSERT(node2.prev() == &node2);
     std::cout << "test_remove_from passed." << std::endl;
 }
+#endif
 
 // Test the push_to_front() method
 static void test_push_to_front() {
@@ -179,6 +181,6 @@ void tst_dlist() {
     test_detach();
     test_invariant();
     test_contains();
-    (void)test_remove_from;
+    //test_remove_from;
     std::cout << "All tests passed." << std::endl;
 }
diff --git a/src/test/sls_test.cpp b/src/test/sls_test.cpp
index b40261df3..fe96a5dd9 100644
--- a/src/test/sls_test.cpp
+++ b/src/test/sls_test.cpp
@@ -16,7 +16,7 @@ namespace bv {
         vector<sat::clause_info> const& clauses() const override { return m_clauses; }
         sat::clause_info const& get_clause(unsigned idx) const override { return m_clauses[idx]; }
         ptr_iterator<unsigned> get_use_list(sat::literal lit) override { return ptr_iterator<unsigned>(nullptr, nullptr); }
-        bool flip(sat::bool_var v) override { return true; }
+        void flip(sat::bool_var v) override {  }
         double reward(sat::bool_var v) override { return 0; }
         double get_weigth(unsigned clause_idx) override { return 0; }
         bool is_true(sat::literal lit) override { return true; }