syntax/c.vim |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/syntax/c.vim b/syntax/c.vim
index 8a7b51b..98b6e12 100644
--- a/syntax/c.vim
+++ b/syntax/c.vim
@@ -142,6 +142,11 @@
 " 2. Fix macro continuation \ highlighting within parens
 "
 
+" Disabled by default
+if !exists("use_std_c_syntax")
+  finish
+endif
+
 " Catch sourcing of c.vim by other syntax files and redirect to default file.
 if &syntax != 'c'
   source $VIMRUNTIME/syntax/c.vim