diff --git a/wrappers/Julia/CoolProp.jl b/wrappers/Julia/CoolProp.jl
index 7a7c2360..0671a418 100644
--- a/wrappers/Julia/CoolProp.jl
+++ b/wrappers/Julia/CoolProp.jl
@@ -2,6 +2,16 @@ module CoolProp
 
 export F2K, K2F, HAPropsSI, PropsSI, PhaseSI, get_global_param_string, get_param_index, get_input_pair_index, AbstractState_factory, AbstractState_free, AbstractState_update, AbstractState_keyed_output
 
+# Check the current Julia version to make this Julia 0.4 code compatible with older version
+if VERSION <= VersionNumber(0,4)
+  typealias UInt8 Uint8
+  typealias Ref Ptr
+  typealias RefValue Array
+  errcode = Array(Clong, 1)
+else
+  errcode = Ref{Clong}(0)
+end
+
 const buffer_length = 255
 message_buffer = Array(UInt8, buffer_length)
 
@@ -72,14 +82,12 @@ end
 #        Low-level access
 # ---------------------------------
 
-errcode = Ref{Clong}(0)
-
 # Generate an AbstractState instance, return an integer handle to the state class generated to be used in the other low-level accessor functions
 # param backend The backend you will use, "HEOS", "REFPROP", etc.
 # param fluids '&' delimited list of fluids
 # return A handle to the state class generated
 function AbstractState_factory(backend::String, fluids::String)
-  AbstractState = ccall( (:AbstractState_factory, "CoolProp"), Clong, (Ptr{UInt8},Ptr{UInt8},Ref{Clong},Ptr{UInt8},Clong), backend,fluids,errcode::Base.RefValue{Clong},message_buffer::Array{Uint8,1},buffer_length)
+  AbstractState = ccall( (:AbstractState_factory, "CoolProp"), Clong, (Ptr{UInt8},Ptr{UInt8},Ref{Clong},Ptr{UInt8},Clong), backend,fluids,errcode::RefValue{Clong,1},message_buffer::Array{Uint8,1},buffer_length)
   if errcode[] != 0
     if errcode[] == 1
       error("CoolProp: ", bytestring(convert(Ptr{UInt8}, pointer(message_buffer))))
@@ -95,7 +103,7 @@ end
 # Release a state class generated by the low-level interface wrapper
 # param handle The integer handle for the state class stored in memory
 function AbstractState_free(handle::Clong)
-  ccall( (:AbstractState_free, "CoolProp"), Void, (Clong,Ref{Clong},Ptr{UInt8},Clong), handle,errcode::Base.RefValue{Clong},message_buffer::Array{Uint8,1},buffer_length)
+  ccall( (:AbstractState_free, "CoolProp"), Void, (Clong,Ref{Clong},Ptr{UInt8},Clong), handle,errcode::RefValue{Clong,1},message_buffer::Array{Uint8,1},buffer_length)
   if errcode[] != 0
     if errcode[] == 1
       error("CoolProp: ", bytestring(convert(Ptr{UInt8}, pointer(message_buffer))))
@@ -112,7 +120,7 @@ end
 # param handle The integer handle for the state class stored in memory
 # param fractions The array of fractions
 function AbstractState_set_fractions(handle::Clong,fractions::Array)
-  ccall( (:AbstractState_set_fractions, "CoolProp"), Void, (Clong,Ptr{Cdouble},Clong,Ref{Clong},Ptr{UInt8},Clong), handle,fractions,length(fractions),errcode::Base.RefValue{Clong},message_buffer::Array{Uint8,1},buffer_length)
+  ccall( (:AbstractState_set_fractions, "CoolProp"), Void, (Clong,Ptr{Cdouble},Clong,Ref{Clong},Ptr{UInt8},Clong), handle,fractions,length(fractions),errcode::RefValue{Clong,1},message_buffer::Array{Uint8,1},buffer_length)
   if errcode[] != 0
     if errcode[] == 1
       error("CoolProp: ", bytestring(convert(Ptr{UInt8}, pointer(message_buffer))))
@@ -131,7 +139,7 @@ end
 # param value1 The first input value
 # param value2 The second input value
 function AbstractState_update(handle::Clong,input_pair::Clong,value1::Number,value2::Number)
-  ccall( (:AbstractState_update, "CoolProp"), Void, (Clong,Clong,Cdouble,Cdouble,Ref{Clong},Ptr{UInt8},Clong), handle,input_pair,value1,value2,errcode::Base.RefValue{Clong},message_buffer::Array{Uint8,1},buffer_length)
+  ccall( (:AbstractState_update, "CoolProp"), Void, (Clong,Clong,Cdouble,Cdouble,Ref{Clong},Ptr{UInt8},Clong), handle,input_pair,value1,value2,errcode::RefValue{Clong,1},message_buffer::Array{Uint8,1},buffer_length)
   if errcode[] != 0
     if errcode[] == 1
       error("CoolProp: ", bytestring(convert(Ptr{UInt8}, pointer(message_buffer))))
@@ -148,7 +156,7 @@ end
 # param handle The integer handle for the state class stored in memory
 # param param The integer value for the parameter you want
 function AbstractState_keyed_output(handle::Clong, param::Clong)
-  output = ccall( (:AbstractState_keyed_output, "CoolProp"), Cdouble, (Clong,Clong,Ref{Clong},Ptr{UInt8},Clong), handle,param,errcode::Base.RefValue{Clong},message_buffer::Array{Uint8,1},buffer_length)
+  output = ccall( (:AbstractState_keyed_output, "CoolProp"), Cdouble, (Clong,Clong,Ref{Clong},Ptr{UInt8},Clong), handle,param,errcode::RefValue{Clong,1},message_buffer::Array{Uint8,1},buffer_length)
   if errcode[] != 0
     if errcode[] == 1
       error("CoolProp: ", bytestring(convert(Ptr{UInt8}, pointer(message_buffer))))