diff --git a/src/smt/smt_setup.cpp b/src/smt/smt_setup.cpp
index 9f90c8801..0a13bfe31 100644
--- a/src/smt/smt_setup.cpp
+++ b/src/smt/smt_setup.cpp
@@ -721,8 +721,8 @@ namespace smt {
 
     void setup::setup_r_arith() {
         // to disable theory lra
-        // m_context.register_plugin(alloc(smt::theory_mi_arith, m_manager, m_params));        
-        m_context.register_plugin(alloc(smt::theory_lra, m_manager, m_params));
+        m_context.register_plugin(alloc(smt::theory_mi_arith, m_manager, m_params));        
+        // m_context.register_plugin(alloc(smt::theory_lra, m_manager, m_params));
     }
 
     void setup::setup_mi_arith() {