diff --git a/src/Loggers/LogHParams.jl b/src/Loggers/LogHParams.jl
index c992225..3fef01e 100644
--- a/src/Loggers/LogHParams.jl
+++ b/src/Loggers/LogHParams.jl
@@ -11,7 +11,7 @@ end
 
 DiscreteDomainElem = Union{String, Float64, Bool}
 
-hparams_datatype_sym(::Type{String}) = :DATA_TYPE_STRING
+hparams_datatype_sym(::Type{<:AbstractString}) = :DATA_TYPE_STRING
 hparams_datatype_sym(::Type{Float64}) = :DATA_TYPE_FLOAT64
 hparams_datatype_sym(::Type{Bool}) = :DATA_TYPE_BOOL
 
@@ -19,16 +19,16 @@ function hparams_datatype(domain::DiscreteDomain{T}) where T <: DiscreteDomainEl
     tensorboard.hparams._DataType[hparams_datatype_sym(T)]
 end
 
-ProtoBuf.google.protobuf.Value(x::Number) = Value(number_value=x)
-ProtoBuf.google.protobuf.Value(x::Bool) = Value(bool_value=x)
-ProtoBuf.google.protobuf.Value(x::AbstractString) = Value(string_value=x)
-function ProtoBuf.google.protobuf.Value(x)
+# custom constructors for ProtoBuf.google.protobuf.Value
+function _Protobuf_Value(x)
     @warn "Cannot create a ProtoBuf.google.protobuf.Value of type $(typeof(x)), defaulting to null."
     Value(null_value=Int32(0))
 end
+_Protobuf_Value(x::Bool) = Value(bool_value=x)
+_Protobuf_Value(x::Number) = Value(number_value=x)
+_Protobuf_Value(x::AbstractString) = Value(string_value=x)
 
-
-function ProtoBuf.google.protobuf.ListValue(domain::DiscreteDomain{T}) where T <: DiscreteDomainElem
+function _Protobuf_ListValue(domain::DiscreteDomain{T})where T <: DiscreteDomainElem
     ProtoBuf.google.protobuf.ListValue(
         values = ProtoBuf.google.protobuf.Value.(domain.values)
     )
@@ -58,7 +58,7 @@ function HParamInfo(hparam::HParam)
                     else
                         @assert isa(domain, DiscreteDomain)
                         (_type = hparams_datatype(domain),
-                        domain_discrete = ProtoBuf.google.protobuf.ListValue(domain))
+                        domain_discrete = _Protobuf_ListValue(domain))
                     end
     HParamInfo(;name = hparam.name,
                description = hparam.description,
@@ -177,7 +177,7 @@ function hparams_summary(hparams_dict::Dict{HParam, Any},
                 group_name = group_name,
                 start_time_secs = start_time_secs,
                 hparams = Dict(
-                    hparam.name => ProtoBuf.google.protobuf.Value(val)
+                    hparam.name => _ProtoBuf_Value(val)
                     for (hparam, val) ∈ hparams_dict
                 )
             )