diff --git a/src/sage/rings/convert/mpfi.pyx b/src/sage/rings/convert/mpfi.pyx
index 18991667ce5..4007455bcfd 100644
--- a/src/sage/rings/convert/mpfi.pyx
+++ b/src/sage/rings/convert/mpfi.pyx
@@ -145,6 +145,9 @@ cdef int _from_str_question_style(mpfi_ptr x, bytes s, int base) except -1:
         True
         sage: x in F(x.str(style="question", error_digits=0))
         True
+        sage: F("1.123456789123456789123456789123456789123456789123456789123456789123456789?987654321987654321987654321e500").endpoints()  # rel tol 1e-290
+        (1.123456789123456789123456789123456789123456788135802467135802467135802468e500,
+         1.12345678912345678912345678912345678912345679011111111111111111111111111e500)
 
     Stress test::