diff --git a/src/GrpAb/GrpAbFinGen.jl b/src/GrpAb/GrpAbFinGen.jl
index 9d468a5a65..7a877a42c9 100644
--- a/src/GrpAb/GrpAbFinGen.jl
+++ b/src/GrpAb/GrpAbFinGen.jl
@@ -1146,7 +1146,7 @@ function _sub_integer_snf(G::GrpAbFinGen, n::ZZRingElem, add_to_lattice::Bool =
     ind += 1
   end
   if ind == ngens(G) && gcd(n, G.snf[ind]) == G.snf[ind]
-    Gnew = GrpAbFinGenElem(Int[])
+    Gnew = GrpAbFinGen(Int[])
     mp = hom(Gnew, G, GrpAbFinGenElem[])
     if add_to_lattice
       append!(L, mp)
diff --git a/src/Misc/Integer.jl b/src/Misc/Integer.jl
index b4c9bc5dd4..02c88f6411 100644
--- a/src/Misc/Integer.jl
+++ b/src/Misc/Integer.jl
@@ -274,8 +274,8 @@ function ecm(a::ZZRingElem, B1::Int, B2::Int, ncrv::Int, rnd=flint_rand_ctx)
 end
 
 #data from http://www.mersennewiki.org/index.php/Elliptic_Curve_Method
-B1 = [2, 11, 50, 250, 1000, 3000, 11000, 43000, 110000, 260000, 850000, 2900000];
-nC = [25, 90, 300, 700, 1800, 5100, 10600, 19300, 49000, 124000, 210000, 340000];
+const B1 = [2, 11, 50, 250, 1000, 3000, 11000, 43000, 110000, 260000, 850000, 2900000];
+const nC = [25, 90, 300, 700, 1800, 5100, 10600, 19300, 49000, 124000, 210000, 340000];
 
 function ecm(a::ZZRingElem, max_digits::Int=div(ndigits(a), 3), rnd=flint_rand_ctx)
   n = ndigits(a, 10)
@@ -532,7 +532,7 @@ function Base.iterate(D::Divisors{T}, i) where {T}
   if x === nothing
     return x
   end
-  return D.f(x[1]), x[2]
+  return D.f(x[1])::T, x[2]
 end
 
 function Base.show(io::IO, D::Divisors)
diff --git a/src/QuadForm/Quad/NormalForm.jl b/src/QuadForm/Quad/NormalForm.jl
index bea322e5f5..98f7bae724 100644
--- a/src/QuadForm/Quad/NormalForm.jl
+++ b/src/QuadForm/Quad/NormalForm.jl
@@ -836,9 +836,10 @@ function _min_nonsquare(p)
   Rx, x = polynomial_ring(GF(p, cached = false), "x", cached = false)
   for i in 1:p
     if length(factor(x^2 - i)) == 1
-      return i
+      return Int(i)
     end
   end
+  error("this can't be reached")
 end
 
 function _issquare(d::Nemo.ZZModRingElem, p::ZZRingElem)