diff --git a/src/smt/smt_internalizer.cpp b/src/smt/smt_internalizer.cpp
index 88623bb2c..63e5b0e7b 100644
--- a/src/smt/smt_internalizer.cpp
+++ b/src/smt/smt_internalizer.cpp
@@ -616,7 +616,7 @@ namespace smt {
         if (m_non_lambdas.contains(q))
             return;
         m_non_lambdas.insert(q);
-        push_trail(insert_obj_trail<quantifier>(m_lambdas, q));
+        push_trail(insert_obj_trail<quantifier>(m_non_lambdas, q));
         if (m_lambdas.contains(q)) {
             m_lambdas.remove(q);
             push_trail(remove_obj_trail<quantifier>(m_lambdas, q));