diff --git a/src/nlsat/nlsat_solver.cpp b/src/nlsat/nlsat_solver.cpp
index 97cac90fc..5bc0d214f 100644
--- a/src/nlsat/nlsat_solver.cpp
+++ b/src/nlsat/nlsat_solver.cpp
@@ -333,7 +333,7 @@ namespace nlsat {
 
         void checkpoint() {
             if (!m_rlimit.inc()) throw solver_exception(m_rlimit.get_cancel_msg()); 
-            if (memory::get_allocation_size() > m_max_memory) throw solver_exception(Z3_MAX_MEMORY_MSG);
+            if (memory::get_allocation_size()/(1 << 20) > m_max_memory) throw solver_exception(Z3_MAX_MEMORY_MSG);
         }
 
         // -----------------------