diff --git a/runtime/syntax/arduino.vim b/runtime/syntax/arduino.vim
index 14299a4..4a4ef82 100644
--- a/runtime/syntax/arduino.vim
+++ b/runtime/syntax/arduino.vim
@@ -10,20 +10,13 @@
 
 " Thanks to Rik, Erik Nomitch, Adam Obeng and Graeme Cross for helpful feedback!
 
-" 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
 
 " Read the C syntax to start with
-if version < 600
-  so <sfile>:p:h/cpp.vim
-else
-  runtime! syntax/cpp.vim
-endif
+runtime! syntax/cpp.vim
 
 syn keyword arduinoConstant HIGH LOW INPUT OUTPUT
 syn keyword arduinoConstant DEC BIN HEX OCT BYTE