diff --git a/lib/lexer.js b/lib/lexer.js
index 1523fd68..1263d714 100644
--- a/lib/lexer.js
+++ b/lib/lexer.js
@@ -595,7 +595,7 @@
   STRING_NEWLINES = /\n[ \t]*/g;
   NO_NEWLINE = /^([+\*&|\/\-%=<>!.\\][<>=&|]*|and|or|is|isnt|not|delete|typeof|instanceof)$/;
   HEREDOC_INDENT = /(\n+([ \t]*)|^([ \t]+))/g;
-  ASSIGNED = /^\s*(([a-zA-Z\$_@]\w*|["'][^\r\n]+?["'])[ \t]*?[:=][^=])/;
+  ASSIGNED = /^\s*(([a-zA-Z\$_@]\w*|["'][^\r\n]+?["']|\d+)[ \t]*?[:=][^=])/;
   NEXT_CHARACTER = /^\s*(\S)/;
   NOT_REGEX = ['NUMBER', 'REGEX', '++', '--', 'FALSE', 'NULL', 'TRUE', ']'];
   CALLABLE = ['IDENTIFIER', 'SUPER', ')', ']', '}', 'STRING', '@', 'THIS', '?', '::'];
diff --git a/src/lexer.coffee b/src/lexer.coffee
index a1d1066b..21045472 100644
--- a/src/lexer.coffee
+++ b/src/lexer.coffee
@@ -531,7 +531,7 @@ MULTILINER      = /\n/g
 STRING_NEWLINES = /\n[ \t]*/g
 NO_NEWLINE      = /^([+\*&|\/\-%=<>!.\\][<>=&|]*|and|or|is|isnt|not|delete|typeof|instanceof)$/
 HEREDOC_INDENT  = /(\n+([ \t]*)|^([ \t]+))/g
-ASSIGNED        = /^\s*(([a-zA-Z\$_@]\w*|["'][^\r\n]+?["'])[ \t]*?[:=][^=])/
+ASSIGNED        = /^\s*(([a-zA-Z\$_@]\w*|["'][^\r\n]+?["']|\d+)[ \t]*?[:=][^=])/
 NEXT_CHARACTER  = /^\s*(\S)/
 
 # Tokens which a regular expression will never immediately follow, but which
diff --git a/test/test_literals.coffee b/test/test_literals.coffee
index 93b9b856..5c1d3c57 100644
--- a/test/test_literals.coffee
+++ b/test/test_literals.coffee
@@ -197,11 +197,12 @@ ok obj.misdent.toString() is ',,,'
 
 second = (x, y) -> y
 obj = then second 'the',
-  one: 1
+  1: 1
   two:
     three: ->
       four five,
         six: seven
   three: 3
 
+ok obj[1] is 1
 ok obj.three is 3
\ No newline at end of file