diff --git a/src/qe/qe_sat_tactic.cpp b/src/qe/qe_sat_tactic.cpp
index 854e15493..b4a1a6a8b 100644
--- a/src/qe/qe_sat_tactic.cpp
+++ b/src/qe/qe_sat_tactic.cpp
@@ -226,7 +226,7 @@ namespace qe {
             return alloc(sat_tactic, m);
         }
 
-        ~sat_tactic() {
+        virtual ~sat_tactic() {
             for (unsigned i = 0; i < m_solvers.size(); ++i) {
                 dealloc(m_solvers[i]);
             }