diff --git a/src/InMemoryDatasets.jl b/src/InMemoryDatasets.jl
index 9c6a276..69fb69a 100644
--- a/src/InMemoryDatasets.jl
+++ b/src/InMemoryDatasets.jl
@@ -120,7 +120,8 @@ export
       update!
 
 
-
+SMALLSIGNED = Union{Int16, Int32, Int8}
+SMALLUNSIGNED = Union{UInt16, UInt32, UInt8}
 
 
 include("other/index.jl")
diff --git a/src/byrow/row_functions.jl b/src/byrow/row_functions.jl
index 9642a81..2d7df23 100644
--- a/src/byrow/row_functions.jl
+++ b/src/byrow/row_functions.jl
@@ -34,8 +34,8 @@ function row_sum(ds::AbstractDataset, f::Function,  cols = names(ds, Union{Missi
     CT = mapreduce(eltype, promote_type, view(_columns(ds),colsidx))
     T = Core.Compiler.return_type(f, Tuple{CT})
 	CT = our_nonmissingtype(T)
-	CT <: Base.SmallSigned ? CT = Int : nothing
-	CT <: Base.SmallUnsigned ? CT = UInt : nothing
+	CT <: SMALLSIGNED ? CT = Int : nothing
+	CT <: SMALLUNSIGNED ? CT = UInt : nothing
 	CT <: Bool ? CT = Int : nothing
 	T = Union{Missing, CT}
     init0 = _missings(T, nrow(ds))
@@ -69,8 +69,8 @@ function row_prod(ds::AbstractDataset, f::Function, cols = names(ds, Union{Missi
     CT = mapreduce(eltype, promote_type, view(_columns(ds),colsidx))
     T = Core.Compiler.return_type(f, Tuple{CT})
 	CT = our_nonmissingtype(T)
-	CT <: Base.SmallSigned ? CT = Int : nothing
-	CT <: Base.SmallUnsigned ? CT = UInt : nothing
+	CT <: SMALLSIGNED ? CT = Int : nothing
+	CT <: SMALLUNSIGNED ? CT = UInt : nothing
 	CT <: Bool ? CT = Int : nothing
 	T = Union{Missing, CT}
     init0 = _missings(T, nrow(ds))
@@ -744,9 +744,9 @@ function row_cumsum!(ds::Dataset, cols = names(ds, Union{Missing, Number}); miss
     colsidx = index(ds)[cols]
     T = mapreduce(eltype, promote_type, view(_columns(ds),colsidx))
     if T <: Union{Missing, INTEGERS}
-        T <: Union{Missing, Base.SmallSigned}
-        T = T <: Union{Missing, Base.SmallSigned, Bool} ? Union{Int, Missing} : T
-        T = T <: Union{Missing, Base.SmallUnsigned} ?  Union{Missing, UInt} : T
+        T <: Union{Missing, SMALLSIGNED}
+        T = T <: Union{Missing, SMALLSIGNED, Bool} ? Union{Int, Missing} : T
+        T = T <: Union{Missing, SMALLUNSIGNED} ?  Union{Missing, UInt} : T
     end
     for i in colsidx
         if eltype(ds[!, i]) >: Missing
diff --git a/src/sort/gatherby.jl b/src/sort/gatherby.jl
index 694ece8..c914b74 100644
--- a/src/sort/gatherby.jl
+++ b/src/sort/gatherby.jl
@@ -248,8 +248,8 @@ end
 function gatherby_mapreduce(gds::GatherBy, f, op, col::ColumnIndex, nt, init, ::Val{T}; promotetypes = false, threads = true) where T
 	CT = T
 	if promotetypes
-	    T <: Base.SmallSigned ? CT = Int : nothing
-		T <: Base.SmallUnsigned ? CT = UInt : nothing
+	    T <: SMALLSIGNED ? CT = Int : nothing
+		T <: SMALLUNSIGNED ? CT = UInt : nothing
 	end
 	res = allocatecol(Union{CT, Missing}, gds.lastvalid)
     fill!(res, init)
diff --git a/src/stat/hp_stat.jl b/src/stat/hp_stat.jl
index c88861c..ed5d6aa 100644
--- a/src/stat/hp_stat.jl
+++ b/src/stat/hp_stat.jl
@@ -42,8 +42,8 @@ function hp_sum(f, x::AbstractVector{T}) where {T}
     cz = div(n, nt)
     cz == 0 && return stat_sum(f, x)
     CT = Core.Compiler.return_type(f, Tuple{our_nonmissingtype(eltype(x))})
-    CT <: Base.SmallSigned ? CT = Int : nothing
-    CT <: Base.SmallUnsigned ? CT = UInt : nothing
+    CT <: SMALLSIGNED ? CT = Int : nothing
+    CT <: SMALLUNSIGNED ? CT = UInt : nothing
     CT <: Bool ? CT = Int : nothing
     if T >: Missing
         CT = Union{Missing,CT}