diff --git a/src/sage/matrix/matrix2.pyx b/src/sage/matrix/matrix2.pyx
index 3910dcb1694..1b4050cd379 100644
--- a/src/sage/matrix/matrix2.pyx
+++ b/src/sage/matrix/matrix2.pyx
@@ -10649,10 +10649,8 @@ cdef class Matrix(Matrix1):
             sage: mu*G == A
             True
         """
-        import sage.rings.real_double
-        import sage.rings.complex_double
         R = self.base_ring()
-        if R in [sage.rings.real_double.RDF, sage.rings.complex_double.CDF]:
+        if instance(R, (sage.rings.abc.RealDoubleField, sage.rings.abc.ComplexDoubleField)):
             Q, R = self.transpose().QR()
             m = R.nrows(); n = R.ncols()
             if m > n: