diff --git a/src/smt/theory_dense_diff_logic_def.h b/src/smt/theory_dense_diff_logic_def.h
index 369209e49..88e95e517 100644
--- a/src/smt/theory_dense_diff_logic_def.h
+++ b/src/smt/theory_dense_diff_logic_def.h
@@ -55,10 +55,8 @@ namespace smt {
         bool is_int  = m_autil.is_int(n->get_owner());
         m_is_int.push_back(is_int);
         m_f_targets.push_back(f_target());
-        typename matrix::iterator it  = m_matrix.begin();
-        typename matrix::iterator end = m_matrix.end();
-        for (; it != end; ++it) {
-            it->push_back(cell());
+        for (auto& rows : m_matrix) {
+            rows.push_back(cell());
         }
         m_matrix.push_back(row());
         row & r = m_matrix.back();
@@ -367,10 +365,8 @@ namespace smt {
             m_is_int.shrink(old_num_vars);
             m_f_targets.shrink(old_num_vars);
             m_matrix.shrink(old_num_vars);
-            typename matrix::iterator it  = m_matrix.begin();
-            typename matrix::iterator end = m_matrix.end();
-            for (; it != end; ++it) {
-                it->shrink(old_num_vars);
+            for (auto& cells : m_matrix) {
+                cells.shrink(old_num_vars);
             }
         }
     }