diff --git a/src/indexing.jl b/src/indexing.jl
index 9533022..dd15eca 100644
--- a/src/indexing.jl
+++ b/src/indexing.jl
@@ -78,16 +78,23 @@ end
 
 # test if the value X[i] is null without checking the `I` index validity
 unsafe_isnull(X::NullableArray, I::Int...) = Base.unsafe_getindex(X.isnull, I...)
+unsafe_isnull{T}(X::AbstractNullableArray{T}, I::Int...) = isnull(Base.unsafe_getindex(X, I...))
 
 # returns non-null element of X wrapped in Nullable
 function unsafe_getindex_notnull(X::NullableArray, I::Int...)
     return Nullable(Base.unsafe_getindex(X.values, I...))
 end
+function unsafe_getindex_notnull{T}(X::AbstractNullableArray{T}, I::Int...)
+    return Base.unsafe_getindex(X, I...)
+end
 
 # return non-null element of X
 function unsafe_getvalue_notnull(X::NullableArray, I::Int...)
     return Base.unsafe_getindex(X.values, I...)
 end
+function unsafe_getvalue_notnull{T}(X::AbstractNullableArray{T}, I::Int...)
+    return get(Base.unsafe_getindex(X, I...))
+end
 
 if VERSION >= v"0.5.0-dev+4697"
     function Base.checkindex(::Type{Bool}, inds::AbstractUnitRange, i::Nullable)