diff --git a/src/sat/sat_lookahead.cpp b/src/sat/sat_lookahead.cpp
index d79aeffde..32cc877dd 100644
--- a/src/sat/sat_lookahead.cpp
+++ b/src/sat/sat_lookahead.cpp
@@ -678,7 +678,7 @@ namespace sat {
         for (literal u : succ) {
             SASSERT(u != l);
             // l => u
-            if (u.index() > l.index() && is_stamped(u)) {
+            if (u.index() > (~l).index() && is_stamped(u)) {
                 add_arc(~l, ~u);
                 add_arc( u,  l);
             }
diff --git a/src/sat/tactic/goal2sat.cpp b/src/sat/tactic/goal2sat.cpp
index 7c703653c..75231f274 100644
--- a/src/sat/tactic/goal2sat.cpp
+++ b/src/sat/tactic/goal2sat.cpp
@@ -921,7 +921,7 @@ struct sat2goal::imp {
                 }
             }
         }
-        
+                
         virtual void operator()(model_ref & md) {
             TRACE("sat_mc", tout << "before sat_mc\n"; model_v2_pp(tout, *md); display(tout););
             // REMARK: potential problem