diff --git a/src/sat/sat_lookahead.h b/src/sat/sat_lookahead.h
index 420256e59..d2aa164eb 100644
--- a/src/sat/sat_lookahead.h
+++ b/src/sat/sat_lookahead.h
@@ -152,11 +152,11 @@ namespace sat {
         void update_prefix(literal l) {
             bool_var x = l.var();
 
-            unsigned p = m_prefix[x].m_prefix;            
-            if (m_prefix[x].m_length >= m_trail_lim.size() ||
+            unsigned p = m_vprefix[x].m_prefix;            
+            if (m_vprefix[x].m_length >= m_trail_lim.size() ||
                 ((p | m_prefix) != m_prefix)) {
-                m_prefix[x].m_length = m_trail_lim.size();
-                m_prefix[x].m_prefix = m_prefix;
+                m_vprefix[x].m_length = m_trail_lim.size();
+                m_vprefix[x].m_prefix = m_prefix;
             }
         }
 
diff --git a/src/test/sat_local_search.cpp b/src/test/sat_local_search.cpp
index f4dee3061..23558ea44 100644
--- a/src/test/sat_local_search.cpp
+++ b/src/test/sat_local_search.cpp
@@ -76,7 +76,9 @@ void tst_sat_local_search(char ** argv, int argc, int& i) {
     reslimit limit;
     params_ref params;
     sat::solver solver(params, limit);
-    sat::local_search local_search(solver);
+    sat::local_search local_search;
+
+    local_search.import(solver, true);
     char const* file_name = argv[i + 1];
     ++i;