diff --git a/src/accumulator.jl b/src/accumulator.jl
index feaed0a3..dc923f3d 100644
--- a/src/accumulator.jl
+++ b/src/accumulator.jl
@@ -61,8 +61,6 @@ Base.setindex!(ct::Accumulator, x, v) = setindex!(ct.map, x, v)
 
 Base.haskey(ct::Accumulator, x) = haskey(ct.map, x)
 
-Base.keys(ct::Accumulator) = keys(ct.map)
-
 Base.values(ct::Accumulator) = values(ct.map)
 
 Base.sum(ct::Accumulator) = sum(values(ct.map))
diff --git a/src/circular_buffer.jl b/src/circular_buffer.jl
index a9378fc9..5f035748 100644
--- a/src/circular_buffer.jl
+++ b/src/circular_buffer.jl
@@ -182,8 +182,6 @@ Return the number of elements currently in the buffer.
 """
 Base.length(cb::CircularBuffer) = cb.length
 
-Base.eltype(::Type{CircularBuffer{T}}) where T = T
-
 """
     size(cb::CircularBuffer)
 
@@ -191,8 +189,6 @@ Return a tuple with the size of the buffer.
 """
 Base.size(cb::CircularBuffer) = (length(cb),)
 
-Base.convert(::Type{Array}, cb::CircularBuffer{T}) where {T} = T[x for x in cb]
-
 """
     isempty(cb::CircularBuffer)