diff --git a/src/biosequence/indexing.jl b/src/biosequence/indexing.jl
index 4a87059c..c2634965 100644
--- a/src/biosequence/indexing.jl
+++ b/src/biosequence/indexing.jl
@@ -11,6 +11,9 @@
     (i % UInt) - 1 < (lastindex(seq) % UInt) ? (@inbounds seq[i], i + 1) : nothing
 end
 
+lastbitindex(x::BioSequence) = bitindex(x, lastindex(x))
+firstbitindex(x::BioSequence) = bitindex(x, firstindex(x))
+
 ## Bounds checking
 function Base.checkbounds(x::BioSequence, i::Integer)
     firstindex(x) ≤ i ≤ lastindex(x) || throw(BoundsError(x, i))
diff --git a/src/bit-manipulation/bit-manipulation.jl b/src/bit-manipulation/bit-manipulation.jl
index 253bdfb0..f1d2f8ff 100644
--- a/src/bit-manipulation/bit-manipulation.jl
+++ b/src/bit-manipulation/bit-manipulation.jl
@@ -1,6 +1,4 @@
 
-include("bitindex.jl")
-
 const BitUnsigned = Union{UInt8, UInt16, UInt32, UInt64, UInt128}
 
 @inline function reversebits(x::T, ::BitsPerSymbol{2}) where T <: BitUnsigned