32 vs 64-bit invoking API

Hi,

On our company we are switching from 32 to 64-bit Office. I invoke API code and get compile error after installing 64-bit office. I've read online it's possible to get API to work on both 32 and 64-bit by applying code:

#If VBA7 Then

 Declare PtrSafe Sub...

#Else

 Declare Sub...

#EndIf

I've adapted my code to above but still I get syntax error below on 64-bit installed Office.

#If VBA7 Then

    'Add PtrSafe to be able to run on 64-bit
    
    'THIS CODE IS OK ON 64-bit OFFICE
    Declare PtrSafe Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" _
    (ByVal lpbuffer As String, nSize As Long) As Long
   

#Else
    
    'Remove PtrSafe to be able to run on 32-bit
    
    'THIS CODE RETURNS SYNTAX ERROR ON 64-bit OFFICE
    Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" _
    (ByVal lpbuffer As String, nSize As Long) As Long


#End If

Any ideas what I'm doing wrong?