diff --git a/src/deprecated.jl b/src/deprecated.jl
index f5e187b1e5..233fe36246 100644
--- a/src/deprecated.jl
+++ b/src/deprecated.jl
@@ -529,7 +529,7 @@ function bytestotype(::Type{N},
     end
 end
 
-let out = Vector{Float64}(1)
+let out = Vector{Float64}(undef, 1)
     global bytestotype
     function bytestotype(::Type{N},
                          bytes::Vector{UInt8},