diff --git a/src/muz/transforms/dl_mk_coi_filter.cpp b/src/muz/transforms/dl_mk_coi_filter.cpp
index f78914b1c..ba85e569a 100644
--- a/src/muz/transforms/dl_mk_coi_filter.cpp
+++ b/src/muz/transforms/dl_mk_coi_filter.cpp
@@ -133,9 +133,11 @@ namespace datalog {
             if (engine.get_fact(pred).is_reachable())
                 should_keep = true;
             else if (m_context.get_model_converter()) {
-                for (rule* pr : source.get_predicate_rules(pred))
+                for (rule* pr : source.get_predicate_rules(pred)) 
                     for (unsigned i = 0; i < pr->get_uninterpreted_tail_size(); ++i)
-                        should_keep |= pr->get_tail(i)->get_decl() != pred;
+                        if (pr->get_tail(i)->get_decl() != pred)
+                            // don't try to eliminate across predicates
+                            return nullptr;
             }
             else 
                 continue;