diff --git a/src/smt/theory_utvpi_def.h b/src/smt/theory_utvpi_def.h
index 54d544b6f..a78fff1f8 100644
--- a/src/smt/theory_utvpi_def.h
+++ b/src/smt/theory_utvpi_def.h
@@ -545,7 +545,7 @@ namespace smt {
         if (coeffs.empty()) {
             return mk_num(n, w);
         }
-        if (coeffs.size() == 1 && coeffs[0].second.is_one()) {
+        if (coeffs.size() == 1 && coeffs[0].second.is_one() && ctx.e_internalized(n)) {
             return coeffs[0].first;
         }
         if (coeffs.size() == 2) {