diff --git a/src/tactic/fpa/qffpa_tactic.cpp b/src/tactic/fpa/qffpa_tactic.cpp
index 04ffc281a..f9b7f88a1 100644
--- a/src/tactic/fpa/qffpa_tactic.cpp
+++ b/src/tactic/fpa/qffpa_tactic.cpp
@@ -57,6 +57,8 @@ struct is_non_qffpa_predicate {
             return;
         if (fid == u.get_family_id())
             return;
+        if (is_uninterp_const(n))
+            return;
 
         throw found();
     }
@@ -83,6 +85,8 @@ struct is_non_qffpabv_predicate {
             return;
         if (fid == fu.get_family_id() || fid == bu.get_family_id())
             return;
+        if (is_uninterp_const(n))
+            return;
 
         throw found();
     }