diff --git a/REQUIRE b/REQUIRE
index 48df863..6eb57c1 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1,2 +1,3 @@
 julia 0.6
 Primes
+Compat
diff --git a/src/WignerSymbols.jl b/src/WignerSymbols.jl
index 27cc1be..7eb58ec 100644
--- a/src/WignerSymbols.jl
+++ b/src/WignerSymbols.jl
@@ -2,6 +2,17 @@ __precompile__(true)
 module WignerSymbols
 export δ, Δ, clebschgordan, wigner3j, wigner6j, racahV, racahW
 
+if VERSION <= v"0.7.0-DEV.262"
+    include("mpz.jl")
+    using .MPZ
+else
+    using Base.GMP.MPZ
+end
+
+using Compat
+
+
+
 include("primefactorization.jl")
 
 const Wigner3j = Dict{Tuple{UInt,UInt,UInt,Int,Int},Tuple{Rational{BigInt},Rational{BigInt}}}()
@@ -283,8 +294,8 @@ function compute3jseries(β₁, β₂, β₃, α₁, α₂)
     krange = max(α₁, α₂, zero(α₁)):min(β₁, β₂, β₃)
     T = PrimeFactorization{eltype(eltype(factorialtable))}
 
-    nums = Vector{T}(length(krange))
-    dens = Vector{T}(length(krange))
+    nums = Vector{T}(uninitialized, length(krange))
+    dens = Vector{T}(uninitialized, length(krange))
     for (i, k) in enumerate(krange)
         num = iseven(k) ? one(T) : -one(T)
         den = primefactorial(k)*primefactorial(k-α₁)*primefactorial(k-α₂)*
@@ -302,8 +313,8 @@ function compute6jseries(β₁, β₂, β₃, α₁, α₂, α₃, α₄)
     krange = max(α₁, α₂, α₃, α₄):min(β₁, β₂, β₃)
     T = PrimeFactorization{eltype(eltype(factorialtable))}
 
-    nums = Vector{T}(length(krange))
-    dens = Vector{T}(length(krange))
+    nums = Vector{T}(uninitialized, length(krange))
+    dens = Vector{T}(uninitialized, length(krange))
     for (i, k) in enumerate(krange)
         num = iseven(k) ? primefactorial(k+1) : -primefactorial(k+1)
         den = primefactorial(k-α₁)*primefactorial(k-α₂)*primefactorial(k-α₃)*
diff --git a/src/primefactorization.jl b/src/primefactorization.jl
index c0891bf..30fc0e1 100644
--- a/src/primefactorization.jl
+++ b/src/primefactorization.jl
@@ -1,14 +1,6 @@
 using Primes.isprime
 import Base.divgcd
 
-if VERSION <= v"0.7.0-DEV.262"
-    include("mpz.jl")
-    using .MPZ
-else
-    using Base.GMP.MPZ
-end
-
-
 const primetable = [2,3,5]
 const factortable = [UInt8[], UInt8[1], UInt8[0,1], UInt8[2], UInt8[0,0,1]]
 const factorialtable = [UInt32[], UInt32[], UInt32[1], UInt32[1,1], UInt32[3,1], UInt32[3,1,1]]
diff --git a/test/runtests.jl b/test/runtests.jl
index f59b6d2..a9182bf 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -4,6 +4,7 @@ end
 
 using Test
 using WignerSymbols
+using Compat
 
 smalljlist = 0:1//2:10
 largejlist = 0:1//2:1000
@@ -113,8 +114,8 @@ end
         m1range = -j1:j1
         m2range = -j2:j2
         m3range = -j3:j3
-        V1 = Array{Float64}(length(m1range),length(m2range),length(m3range))
-        V2 = Array{Float64}(length(m1range),length(m2range),length(m3range))
+        V1 = Array{Float64}(uninitialized, length(m1range),length(m2range),length(m3range))
+        V2 = Array{Float64}(uninitialized, length(m1range),length(m2range),length(m3range))
         for J in max(abs(j1-j2-j3),abs(j1-j2+j3),abs(j1+j2-j3)):(j1+j2+j3)
             J12range = max(abs(j1-j2),abs(J-j3)):min((j1+j2),(J+j3))
             J23range = max(abs(j2-j3),abs(j1-J)):min((j2+j3),(j1+J))