diff --git a/src/edits/Deletion.jl b/src/edits/Deletion.jl
index 5d9d956..09af797 100644
--- a/src/edits/Deletion.jl
+++ b/src/edits/Deletion.jl
@@ -26,7 +26,7 @@ function _refbases(d::Deletion, reference::S, pos::UInt) where {S<:BioSequence}
     end
 end
 
-function _altbases(d::Deletion, reference::S, pos::UInt) where {S<:BioSequence}
+function _altbases(::Deletion, reference::S, pos::UInt) where {S<:BioSequence}
     if pos == 1
         return S([reference[pos + 1]])
     else
diff --git a/src/edits/Insertion.jl b/src/edits/Insertion.jl
index bba1b25..abf9000 100644
--- a/src/edits/Insertion.jl
+++ b/src/edits/Insertion.jl
@@ -18,7 +18,7 @@ Base.length(x::Insertion) = length(x.seq)
 Base.:(==)(x::Insertion, y::Insertion) = x.seq == y.seq
 Base.hash(x::Insertion, h::UInt) = hash(Insertion, hash(x.seq, h))
 
-function _refbases(i::Insertion, reference::S, pos::UInt) where {S<:BioSequence}
+function _refbases(::Insertion, reference::S, pos::UInt) where {S<:BioSequence}
     return S([reference[pos]])
 end
 
diff --git a/src/edits/Substitution.jl b/src/edits/Substitution.jl
index 858b33a..6d1d2c0 100644
--- a/src/edits/Substitution.jl
+++ b/src/edits/Substitution.jl
@@ -12,10 +12,10 @@ Base.length(::Substitution) = 1
 Base.:(==)(x::Substitution, y::Substitution) = x.x == y.x
 Base.hash(x::Substitution, h::UInt) = hash(Substitution, hash(x.x, h))
 
-function _refbases(s::Substitution, reference::S, pos::UInt) where {S<:BioSequence}
+function _refbases(::Substitution, reference::S, pos::UInt) where {S<:BioSequence}
     return S([reference[pos]])
 end
 
-function _altbases(s::Substitution, reference::S, pos::UInt) where {S<:BioSequence}
+function _altbases(s::Substitution, ::S, pos::UInt) where {S<:BioSequence}
     return S([s.x])
 end