diff --git a/runtime/syntax/rpcgen.vim b/runtime/syntax/rpcgen.vim
index 85036dc..ee4cc3f 100644
--- a/runtime/syntax/rpcgen.vim
+++ b/runtime/syntax/rpcgen.vim
@@ -10,11 +10,7 @@
 endif
 
 " Read the C syntax to start with
-if version < 600
-  source <sfile>:p:h/c.vim
-else
-  runtime! syntax/c.vim
-endif
+runtime! syntax/c.vim
 
 syn keyword rpcProgram	program				skipnl skipwhite nextgroup=rpcProgName
 syn match   rpcProgName	contained	"\<\i\I*\>"	skipnl skipwhite nextgroup=rpcProgZone
@@ -28,31 +24,23 @@
 syn match   rpcPassThru			"^\s*%.*$"
 
 " 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_rpcgen_syntax_inits")
-  if version < 508
-    let did_rpcgen_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 rpcProgName	rpcName
-  HiLink rpcProgram	rpcStatement
-  HiLink rpcVersName	rpcName
-  HiLink rpcVersion	rpcStatement
+HiLink rpcProgName	rpcName
+HiLink rpcProgram	rpcStatement
+HiLink rpcVersName	rpcName
+HiLink rpcVersion	rpcStatement
 
-  HiLink rpcDecl	cType
-  HiLink rpcPassThru	cComment
+HiLink rpcDecl	cType
+HiLink rpcPassThru	cComment
 
-  HiLink rpcName	Special
-  HiLink rpcProcNmbr	Delimiter
-  HiLink rpcProgNmbrErr	Error
-  HiLink rpcStatement	Statement
+HiLink rpcName	Special
+HiLink rpcProcNmbr	Delimiter
+HiLink rpcProgNmbrErr	Error
+HiLink rpcStatement	Statement
 
-  delcommand HiLink
-endif
+delcommand HiLink
 
 let b:current_syntax = "rpcgen"