diff --git a/src/Misc/Integer.jl b/src/Misc/Integer.jl
index b6cd15249c..b4c9bc5dd4 100644
--- a/src/Misc/Integer.jl
+++ b/src/Misc/Integer.jl
@@ -416,10 +416,6 @@ function _factors_trial_division(n::ZZRingElem, np::Int=10^5)
 end
 
 
-function (::Type{Base.Rational{BigInt}})(x::QQFieldElem)
-  return Rational{BigInt}(BigInt(numerator(x)), BigInt(denominator(x)))
-end
-
 export euler_phi_inv, Divisors, carmichael_lambda
 
 @doc raw"""