diff --git a/src/julia/Rational.jl b/src/julia/Rational.jl
index 2622c880ad..0f91280763 100644
--- a/src/julia/Rational.jl
+++ b/src/julia/Rational.jl
@@ -193,92 +193,6 @@ function log(a::Rational{T}) where T <: Integer
    a != 1 && throw(DomainError(a, "a must be 1"))
 end
 
-###############################################################################
-#
-#   Unsafe functions
-#
-###############################################################################
-
-# No actual mutation is permitted for Julia types
-# See #1077
-
-function zero!(a::Rational{T}) where T <: Integer
-   n = a.num
-   n = zero!(n)
-   if a.den == 1
-      return Rational{T}(n, a.den)
-   else
-      return Rational{T}(n, T(1))
-   end
-end
-
-function mul!(a::Rational{T}, b::Rational{T}, c::Rational{T}) where T <: Integer
-   n = a.num
-   d = a.den
-   n = mul!(n, b.num, c.num)
-   d = mul!(d, b.den, c.den)
-   if d != 1 && n != 0
-      g = gcd(n, d)
-      n = divexact(n, g)
-      d = divexact(d, g)
-   end
-   if n == 0
-      return Rational{T}(n, T(1))
-   else
-      return Rational{T}(n, d)
-   end
-end
-
-function add!(a::Rational{T}, b::Rational{T}, c::Rational{T}) where T <: Integer
-   if a === b
-      return add!(a, c)
-   elseif a == c
-      return add!(a, b)
-   else # no aliasing
-      n = a.num
-      d = a.den
-      d = mul!(d, b.den, c.den)
-      n = mul!(n, b.num, c.den)
-      n = addmul!(n, b.den, c.num)
-      if d != 1 && n != 0
-         g = gcd(n, d)
-         n = divexact(n, g)
-         d = divexact(d, g)
-      end
-      if n == 0
-         return Rational{T}(n, T(1))
-      else
-         return Rational{T}(n, d)
-      end
-   end
-end
-
-function add!(a::Rational{T}, b::Rational{T}) where T <: Integer
-   if a === b
-      if iseven(a.den)
-         return Rational{T}(a.num, div(b.den, 2))
-      else
-         return Rational{T}(2*a.num, b.den)
-      end
-   else
-      n = a.num
-      n = mul!(n, n, b.den)
-      n = addmul!(n, b.num, a.den)
-      d = a.den
-      d = mul!(d, d, b.den)
-      if d != 1 && n != 0
-         g = gcd(n, d)
-         n = divexact(n, g)
-         d = divexact(d, g)
-      end
-      if n == 0
-         return Rational{T}(n, T(1))
-      else
-         return Rational{T}(n, d)
-      end
-   end
-end
-
 ###############################################################################
 #
 #   Random generation