diff --git a/syntax/markdown.vim b/syntax/markdown.vim
index f68cdb5..b67347a 100644
--- a/syntax/markdown.vim
+++ b/syntax/markdown.vim
@@ -46,7 +46,7 @@ syn match markdownRule "- *- *-[ -]*$" contained
 
 syn match markdownLineBreak "\s\{2,\}$"
 
-syn region markdownIdDeclaration matchgroup=markdownLinkDelimiter start="^ \{0,2\}!\=\[" end="\]:" oneline keepend nextgroup=markdownUrl skipwhite
+syn region markdownIdDeclaration matchgroup=markdownLinkDelimiter start="^ \{0,3\}!\=\[" end="\]:" oneline keepend nextgroup=markdownUrl skipwhite
 syn match markdownUrl "\S\+" nextgroup=markdownUrlTitle skipwhite contained
 syn region markdownUrl matchgroup=markdownUrlDelimiter start="<" end=">" oneline keepend nextgroup=markdownUrlTitle skipwhite contained
 syn region markdownUrlTitle matchgroup=markdownUrlTitleDelimiter start=+"+ end=+"+ keepend contained