diff --git a/src/sat/sat_aig_cuts.cpp b/src/sat/sat_aig_cuts.cpp
index a5e3e84e1..f035388e1 100644
--- a/src/sat/sat_aig_cuts.cpp
+++ b/src/sat/sat_aig_cuts.cpp
@@ -293,6 +293,9 @@ namespace sat {
 
     void aig_cuts::flush_roots(literal_vector const& to_root, node& n) {
         bool changed = false;
+        if (n.is_var()) {
+            return;
+        }
         for (unsigned i = 0; i < n.num_children(); ++i) {
             literal& lit = m_literals[n.offset() + i];
             if (to_root[lit.var()] != lit) {
diff --git a/src/sat/sat_cutset.h b/src/sat/sat_cutset.h
index b9142e7f5..706fd121f 100644
--- a/src/sat/sat_cutset.h
+++ b/src/sat/sat_cutset.h
@@ -14,6 +14,7 @@
 #pragma once
 #include "util/region.h"
 #include "util/debug.h"
+#include "util/util.h"
 #include <algorithm>
 
 namespace sat {