diff --git a/runtime/syntax/sd.vim b/runtime/syntax/sd.vim
index 7fa0e04..015c1f0 100644
--- a/runtime/syntax/sd.vim
+++ b/runtime/syntax/sd.vim
@@ -5,9 +5,8 @@
 " URL: http://netstudent.polito.it/vim_syntax/
 " Last Change: 2012 Feb 03 by Thilo Six
 
-if version < 600
-        syntax clear
-elseif exists("b:current_syntax")
+" quit when a syntax file was already loaded
+if exists("b:current_syntax")
         finish
 endif
 
@@ -51,29 +50,22 @@
 syn keyword sdDelimiter STREAM STREAM_END
 syn match sdError /^search .\{257,}/
 
-if version >= 508 || !exists("did_config_syntax_inits")
-        if version < 508
-                let did_config_syntax_inits = 1
-                command! -nargs=+ HiLink hi link <args>
-        else
-                command! -nargs=+ HiLink hi def link <args>
-        endif
+command! -nargs=+ HiLink hi def link <args>
 
-        HiLink sdIP Number
-		  HiLink sdHostname Type
-        HiLink sdEncoding Identifier
-        HiLink sdCoding Identifier
-        HiLink sdSource Identifier
-        HiLink sdComment Comment
-        HiLink sdIPError Error
-        HiLink sdError Error
-        HiLink sdStatement Statement
-        HiLink sdIPSpecial Special
-        HiLink sdSpecial Special
-		  HiLink sdDelimiter Delimiter
+HiLink sdIP Number
+HiLink sdHostname Type
+HiLink sdEncoding Identifier
+HiLink sdCoding Identifier
+HiLink sdSource Identifier
+HiLink sdComment Comment
+HiLink sdIPError Error
+HiLink sdError Error
+HiLink sdStatement Statement
+HiLink sdIPSpecial Special
+HiLink sdSpecial Special
+HiLink sdDelimiter Delimiter
 
-        delcommand HiLink
-endif
+delcommand HiLink
 
 let b:current_syntax = "sd"