diff --git a/Project.toml b/Project.toml
index 935682c..32f462b 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "LightBSON"
 uuid = "a4a7f996-b3a6-4de6-b9db-2fa5f350df41"
 authors = ["Christian Rorvik <christian.rorvik@gmail.com>"]
-version = "0.2.19"
+version = "0.2.20"
 
 [deps]
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
diff --git a/src/write_buffer.jl b/src/write_buffer.jl
index 8657092..852be10 100644
--- a/src/write_buffer.jl
+++ b/src/write_buffer.jl
@@ -21,6 +21,8 @@ end
 
 @inline Base.sizeof(buffer::BSONWriteBuffer) = buffer.len
 
+@inline Base.elsize(BSONWriteBuffer) = 1
+
 @inline function Base.getindex(buffer::BSONWriteBuffer, i::Integer)
     @boundscheck (i > 0 && i <= buffer.len) || throw(BoundsError(buffer, i))
     @inbounds buffer.data[i]
@@ -43,4 +45,4 @@ end
     buffer.len += 1
     @inbounds buffer.data[buffer.len] = x
     buffer
-end
\ No newline at end of file
+end