diff --git a/syntax/ats.vim b/syntax/ats.vim
index da55cec..aac3d14 100644
--- a/syntax/ats.vim
+++ b/syntax/ats.vim
@@ -30,7 +30,7 @@ syn match   atsSpecial display contained "\\\(x\x\+\|\o\{1,3}\|.\|$\)"
 syn match   atsSpecial display contained "\\\(u\x\{4}\|U\x\{8}\)"
 syn match   atsSpecial '\\n'
 syn match   atsSpecial '@'
-syn match   atsSpecial '#'
+syn match   atsSpecial '#\['
 syn match   atsFormat display "%\(\d\+\$\)\=[-+' #0*]*\(\d*\|\*\|\*\d\+\$\)\(\.\(\d*\|\*\|\*\d\+\$\)\)\=\([hlL]\|ll\)\=\([bdiuoxXDOUfeEgGcCsSpn]\|\[\^\=.[^]]*\]\)" contained
 syn region  atsStringDenot start=+"+ skip=+\\\\\|\\"+ end=+"+ contains=atsSpecial,atsFormat,atsSpecial,@Spell
 syn match   atsCharDenot "'[^\\]'"