diff --git a/python/sage_helper.py b/python/sage_helper.py
index 9bc6861b..3a0e82fd 100644
--- a/python/sage_helper.py
+++ b/python/sage_helper.py
@@ -35,7 +35,7 @@ def sage_method(function):
         from sage.all import RealField, ComplexField, gcd, prod, powerset
         from sage.all import MatrixSpace, matrix, vector, ZZ
         from sage.all import Integer, Rational, QQ, RR, CC, SR
-        from sage.all import is_RealIntervalFieldElement, sqrt
+        from sage.all import sqrt
     except ImportError:
         # Modularized Sage library
         from sage.arith.misc import gcd
@@ -51,10 +51,10 @@ def sage_method(function):
         from sage.rings.integer_ring import ZZ
         from sage.rings.rational import Rational
         from sage.rings.rational_field import QQ
-        from sage.rings.real_mpfi import is_RealIntervalFieldElement
         from sage.rings.real_mpfr import RealField, RR
         from sage.symbolic.ring import SR
 
+    from sage.rings.real_mpfi import is_RealIntervalFieldElement
     from sage.structure.sage_object import SageObject
 
 else: