diff --git a/runtime/syntax/htmlos.vim b/runtime/syntax/htmlos.vim
index f31b9f6..530c046 100644
--- a/runtime/syntax/htmlos.vim
+++ b/runtime/syntax/htmlos.vim
@@ -6,11 +6,8 @@
 " Last Change:	2003 May 11
 "
 
-" For version 5.x: Clear all syntax items
-" For version 6.x: Quit when a syntax file was already loaded
-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
 
@@ -18,12 +15,8 @@
   let main_syntax = 'htmlos'
 endif
 
-if version < 600
-  so <sfile>:p:h/html.vim
-else
-  runtime! syntax/html.vim
-  unlet b:current_syntax
-endif
+runtime! syntax/html.vim
+unlet b:current_syntax
 
 syn cluster htmlPreproc add=htmlosRegion
 
@@ -121,42 +114,34 @@
 endif
 
 " Define the default highlighting.
-" For version 5.7 and earlier: only when not done already
-" For version 5.8 and later: only when an item doesn't have highlighting yet
-if version >= 508 || !exists("did_htmlos_syn_inits")
-  if version < 508
-    let did_htmlos_syn_inits = 1
-    command -nargs=+ HiLink hi link <args>
-  else
-    command -nargs=+ HiLink hi def link <args>
-  endif
+" Only when an item doesn't have highlighting yet
+command -nargs=+ HiLink hi def link <args>
 
-  " The default methods for highlighting.  Can be overridden later
-  HiLink	 htmlosSpecialIdentifier	Operator
-  HiLink	 htmlosIdentifier	Identifier
-  HiLink	 htmlosStorageClass	StorageClass
-  HiLink	 htmlosComment	Comment
-  HiLink	 htmlosBoolean	Boolean
-  HiLink	 htmlosStringSingle	String
-  HiLink	 htmlosStringDouble	String
-  HiLink	 htmlosNumber	Number
-  HiLink	 htmlosFloat	Float
-  HiLink	 htmlosFunctions	Function
-  HiLink	 htmlosRepeat	Repeat
-  HiLink	 htmlosConditional	Conditional
-  HiLink	 htmlosLabel	Label
-  HiLink	 htmlosStatement	Statement
-  HiLink	 htmlosKeyword	Statement
-  HiLink	 htmlosType	Type
-  HiLink	 htmlosDefine	Define
-  HiLink	 htmlosParent	Delimiter
-  HiLink	 htmlosError	Error
-  HiLink	 htmlosTodo	Todo
-  HiLink	htmlosOperator	Operator
-  HiLink	htmlosRelation	Operator
+" The default methods for highlighting.  Can be overridden later
+HiLink	 htmlosSpecialIdentifier	Operator
+HiLink	 htmlosIdentifier	Identifier
+HiLink	 htmlosStorageClass	StorageClass
+HiLink	 htmlosComment	Comment
+HiLink	 htmlosBoolean	Boolean
+HiLink	 htmlosStringSingle	String
+HiLink	 htmlosStringDouble	String
+HiLink	 htmlosNumber	Number
+HiLink	 htmlosFloat	Float
+HiLink	 htmlosFunctions	Function
+HiLink	 htmlosRepeat	Repeat
+HiLink	 htmlosConditional	Conditional
+HiLink	 htmlosLabel	Label
+HiLink	 htmlosStatement	Statement
+HiLink	 htmlosKeyword	Statement
+HiLink	 htmlosType	Type
+HiLink	 htmlosDefine	Define
+HiLink	 htmlosParent	Delimiter
+HiLink	 htmlosError	Error
+HiLink	 htmlosTodo	Todo
+HiLink	htmlosOperator	Operator
+HiLink	htmlosRelation	Operator
 
-  delcommand HiLink
-endif
+delcommand HiLink
 let b:current_syntax = "htmlos"
 
 if main_syntax == 'htmlos'