diff --git a/src/ast/rewriter/seq_eq_solver.cpp b/src/ast/rewriter/seq_eq_solver.cpp
index ca96512f0..6d8734bc9 100644
--- a/src/ast/rewriter/seq_eq_solver.cpp
+++ b/src/ast/rewriter/seq_eq_solver.cpp
@@ -438,6 +438,10 @@ namespace seq {
             !seq.str.is_unit(a) &&
             !seq.str.is_itos(a) &&
             !seq.str.is_nth_i(a) &&
+            !seq.str.is_map(a) &&
+            !seq.str.is_mapi(a) &&
+            !seq.str.is_foldl(a) &&
+            !seq.str.is_foldli(a) &&
             !m.is_ite(a);
     }