diff --git a/src/lists.jl b/src/lists.jl
index 193950e..ab141fa 100644
--- a/src/lists.jl
+++ b/src/lists.jl
@@ -254,7 +254,7 @@ function NullableList{J,K,P}(l::NullableList{J,K,P}) where {J,K,P}
     NullableList{J,K,P}(l.length, l.bitmask, l.offsets, l.values)
 end
 NullableList{J}(l::NullableList{J}) where J = NullableList{J}(l.length, l.bitmask, l.offsets, l.values)
-NullableList{J}(l::NullableList{T}) where {J,T} = NullableList{J}(convert(AbstractVector{J}, p[:]))
+NullableList{J}(l::NullableList{T}) where {J,T} = NullableList{J}(convert(AbstractVector{J}, l[:]))
 NullableList(l::NullableList{J}) where J = NullableList{J}(l)
 
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