diff --git a/after/syntax/ats.vim b/after/syntax/ats.vim
deleted file mode 100644
index 613b23e..0000000
--- a/after/syntax/ats.vim
+++ /dev/null
@@ -1,26 +0,0 @@
-scriptencoding utf-8
-
-syntax match logicalAnd '&&' conceal cchar=∧
-syntax match leq '<=' conceal cchar=≤
-syntax match geq '>=' conceal cchar=≥
-syntax match neq '!=' conceal cchar=≠
-syntax match logicalOr '||' conceal cchar=∨
-
-" FIXME boring white?
-hi! link Conceal Keyword
-
-" store and remove current syntax value
-let old_syntax = b:current_syntax
-unlet b:current_syntax
-
-syn include @c syntax/c.vim
-unlet b:current_syntax
-
-syn region madBlock matchgroup=atsCBlock start="%{" end="%}" contains=@c
-
-hi def link atsCBlock Special
-
-" restore current syntax value
-let b:current_syntax = old_syntax
-
-setlocal conceallevel=1
diff --git a/syntax/ats.vim b/syntax/ats.vim
index 74072a0..22a630d 100644
--- a/syntax/ats.vim
+++ b/syntax/ats.vim
@@ -1,3 +1,5 @@
+scriptencoding utf-8
+
 if !exists('main_syntax')
   if exists('b:current_syntax')
       finish
@@ -63,6 +65,23 @@ highlight link atsKeyword Keyword
 highlight link atsType Type
 highlight link atsIdentifier Identifier
 
+syntax match logicalAnd '&&' conceal cchar=∧
+syntax match leq '<=' conceal cchar=≤
+syntax match geq '>=' conceal cchar=≥
+syntax match neq '!=' conceal cchar=≠
+syntax match logicalOr '||' conceal cchar=∨
+
+" FIXME boring white?
+hi! link Conceal Keyword
+
+syn include @c syntax/c.vim
+
+syn region madBlock matchgroup=atsCBlock start="(%{\|%{^\|%{#" end="%}" contains=@c
+
+hi def link atsCBlock Special
+
+setlocal conceallevel=1
+
 let b:current_syntax = 'ats'
 
 if main_syntax ==# 'ats'