diff --git a/runtime/syntax/c.vim b/runtime/syntax/c.vim
index a520e63..ac4909e 100644
--- a/runtime/syntax/c.vim
+++ b/runtime/syntax/c.vim
@@ -1,7 +1,7 @@
 " Vim syntax file
 " Language:	C
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2015 Feb 27
+" Last Change:	2015 Mar 05
 
 " Quit when a (custom) syntax file was already loaded
 if exists("b:current_syntax")
@@ -47,16 +47,17 @@
 endif
 
 " cCppString: same as cString, but ends at end of line
-if s:ft ==# "cpp" && !exists("cpp_no_cpp11")
+if s:ft ==# "cpp" && !exists("cpp_no_cpp11") && !exists("c_no_cformat")
   " ISO C++11
   syn region	cString		start=+\(L\|u\|u8\|U\|R\|LR\|u8R\|uR\|UR\)\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
   syn region 	cCppString	start=+\(L\|u\|u8\|U\|R\|LR\|u8R\|uR\|UR\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
-elseif s:ft ==# "c" && !exists("c_no_c11")
+elseif s:ft ==# "c" && !exists("c_no_c11") && !exists("c_no_cformat")
   " ISO C99
   syn region	cString		start=+\%(L\|U\|u8\)\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
   syn region	cCppString	start=+\%(L\|U\|u8\)\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
 else
   " older C or C++
+  syn match	cFormat		display "%%" contained
   syn region	cString		start=+L\="+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
   syn region	cCppString	start=+L\="+ skip=+\\\\\|\\"\|\\$+ excludenl end=+"+ end='$' contains=cSpecial,cFormat,@Spell
 endif
@@ -80,7 +81,11 @@
 
 if (s:ft ==# "c" && !exists("c_no_c11")) || (s:ft ==# "cpp" && !exists("cpp_no_cpp11"))
   " ISO C11 or ISO C++ 11
-  syn region	cString		start=+\%(U\|u8\=\)"+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
+  if exists("c_no_cformat")
+    syn region	cString		start=+\%(U\|u8\=\)"+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,@Spell extend
+  else
+    syn region	cString		start=+\%(U\|u8\=\)"+ skip=+\\\\\|\\"+ end=+"+ contains=cSpecial,cFormat,@Spell extend
+  endif
   syn match	cCharacter	"[Uu]'[^\\]'"
   syn match	cCharacter	"[Uu]'[^']*'" contains=cSpecial
   if exists("c_gnu")
@@ -389,8 +394,13 @@
 syn cluster	cLabelGroup	contains=cUserLabel
 syn match	cUserCont	display "^\s*\I\i*\s*:$" contains=@cLabelGroup
 syn match	cUserCont	display ";\s*\I\i*\s*:$" contains=@cLabelGroup
-syn match	cUserCont	display "^\s*\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
-syn match	cUserCont	display ";\s*\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
+if s:ft ==# 'cpp'
+  syn match	cUserCont	display "^\s*\%(class\|struct\|enum\)\@!\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
+  syn match	cUserCont	display ";\s*\%(class\|struct\|enum\)\@!\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
+else
+  syn match	cUserCont	display "^\s*\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
+  syn match	cUserCont	display ";\s*\I\i*\s*:[^:]"me=e-1 contains=@cLabelGroup
+endif
 
 syn match	cUserLabel	display "\I\i*" contained