diff --git a/src/Batches/batch.jl b/src/Batches/batch.jl
index d6a8e350..7553ca0d 100644
--- a/src/Batches/batch.jl
+++ b/src/Batches/batch.jl
@@ -1,4 +1,4 @@
-struct Batch{T,S} <: AbstractVector{T}
+struct Batch{T,S} <: ABatch{T}
   data::CatMat{T,S}
 end
 
diff --git a/src/Batches/catmat.jl b/src/Batches/catmat.jl
index c550f451..9ecc1c9f 100644
--- a/src/Batches/catmat.jl
+++ b/src/Batches/catmat.jl
@@ -1,6 +1,8 @@
 import Base: eltype, size, getindex, setindex!, convert
 
-struct CatMat{T,S} <: AbstractVector{T}
+ABatch{T} = AbstractVector{T}
+
+struct CatMat{T,S} <: ABatch{T}
   data::S
 end
 
diff --git a/src/Batches/seq.jl b/src/Batches/seq.jl
index 5fd2e1b6..34a453c7 100644
--- a/src/Batches/seq.jl
+++ b/src/Batches/seq.jl
@@ -1,4 +1,4 @@
-struct Seq{T,S} <: AbstractVector{T}
+struct Seq{T,S} <: ABatch{T}
   data::CatMat{T,S}
 end