diff --git a/runtime/syntax/aml.vim b/runtime/syntax/aml.vim
index 7cb16f1..1b975cc 100644
--- a/runtime/syntax/aml.vim
+++ b/runtime/syntax/aml.vim
@@ -9,11 +9,8 @@
 "		    of [], in order to avoid -read highlighted,
 "		    or [quote] strings highlighted
 
-" 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
 
@@ -123,35 +120,27 @@
 syn region amlSkip matchgroup=amlOutput start="&type" end="$" contains=amlVar
 
 " 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_aml_syntax_inits")
-  if version < 508
-    let did_aml_syntax_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>
 
-  HiLink amlComment	Comment
-  HiLink amlNumber	Number
-  HiLink amlQuote	String
-  HiLink amlVar	Identifier
-  HiLink amlVar2	Identifier
-  HiLink amlFunction	PreProc
-  HiLink amlDir	Statement
-  HiLink amlDir2	Statement
-  HiLink amlDirSym	Statement
-  HiLink amlOutput	Statement
-  HiLink amlArcCmd	ModeMsg
-  HiLink amlFormedCmd	amlArcCmd
-  HiLink amlTabCmd	amlArcCmd
-  HiLink amlInfoCmd	amlArcCmd
-  HiLink amlVtrCmd	amlArcCmd
-  HiLink amlFormed	amlArcCmd
-  HiLink amlTab	amlArcCmd
+HiLink amlComment	Comment
+HiLink amlNumber	Number
+HiLink amlQuote	String
+HiLink amlVar	Identifier
+HiLink amlVar2	Identifier
+HiLink amlFunction	PreProc
+HiLink amlDir	Statement
+HiLink amlDir2	Statement
+HiLink amlDirSym	Statement
+HiLink amlOutput	Statement
+HiLink amlArcCmd	ModeMsg
+HiLink amlFormedCmd	amlArcCmd
+HiLink amlTabCmd	amlArcCmd
+HiLink amlInfoCmd	amlArcCmd
+HiLink amlVtrCmd	amlArcCmd
+HiLink amlFormed	amlArcCmd
+HiLink amlTab	amlArcCmd
 
-  delcommand HiLink
-endif
+delcommand HiLink
 
 let b:current_syntax = "aml"