diff --git a/Support/lib/gist.rb b/Support/lib/gist.rb
index 09825b5..16fa68d 100755
--- a/Support/lib/gist.rb
+++ b/Support/lib/gist.rb
@@ -68,37 +68,37 @@ def process_selection
   def get_extension
     scope = ENV["TM_SCOPE"].split[0]
     case scope
-    when /source\.actionscript/ ; "as"
-    when /source\.c/, "source.objc" ; "c"
-    when /source\.c\+\+/, "source.objc++" ; "cpp"
+    when /source\.actionscript$/ ; "as"
+    when /source\.c$/, "source.objc" ; "c"
+    when /source\.c\+\+$/, "source.objc++" ; "cpp"
     # common-lisp-mode ; "el"
-    when /source\.css/ ; "css"
-    when /source\.diff/, "meta.diff.range" ; "diff"
+    when /source\.css$/ ; "css"
+    when /source\.diff$/, "meta.diff.range" ; "diff"
     # emacs-lisp-mode ; "el"
-    when /source\.erlang/ ; "erl"
-    when /source\.haskell/, "text.tex.latex.haskel" ; "hs"
-    when /text\.html\.markdown/ ; "md"
-    when /text\.html/ ; "html"
-    when /source\.io/ ; "io"
-    when /source\.java/ ; "java"
-    when /source\.js/ ; "js"
+    when /source\.erlang$/ ; "erl"
+    when /source\.haskell$/, "text.tex.latex.haskel" ; "hs"
+    when /text\.html\.markdown$/ ; "md"
+    when /text\.html$/ ; "html"
+    when /source\.io$/ ; "io"
+    when /source\.java$/ ; "java"
+    when /source\.js$/ ; "js"
     # jde-mode ; "java"
     # js2-mode ; "js"
-    when /source\.lua/ ; "lua"
-    when /source\.ocaml/ ; "ml"
-    when /source\.objc/, "source.objc++" ; "m"
-    when /source\.perl/ ; "pl"
-    when /source\.php/ ; "php"
-    when /source\.python/ ; "sc"
-    when /source\.ruby/ ; "rb" # Emacs bundle uses rbx
-    when /text\.plain/ ; "txt"
-    when /source\.sql/ ; "sql"
-    when /source\.scheme/ ; "scm"
-    when /source\.smalltalk/ ; "st"
-    when /source\.shell/ ; "sh"
-    when /source\.tcl/, "text.html.tcl" ; "tcl"
-    when /source\.lex/ ; "tex"
-    when /text\.xml/, /text.xml.xsl/, /source.plist/, /text.xml.plist/ ; "xml"
+    when /source\.lua$/ ; "lua"
+    when /source\.ocaml$/ ; "ml"
+    when /source\.objc$/, "source.objc++" ; "m"
+    when /source\.perl$/ ; "pl"
+    when /source\.php$/ ; "php"
+    when /source\.python$/ ; "sc"
+    when /source\.ruby$/ ; "rb" # Emacs bundle uses rbx
+    when /text\.plain$/ ; "txt"
+    when /source\.sql$/ ; "sql"
+    when /source\.scheme$/ ; "scm"
+    when /source\.smalltalk$/ ; "st"
+    when /source\.shell$/ ; "sh"
+    when /source\.tcl$/, "text.html.tcl" ; "tcl"
+    when /source\.lex$/ ; "tex"
+    when /text\.xml$/, /text.xml.xsl$/, /source.plist$/, /text.xml.plist$/ ; "xml"
     else "txt"
     end
   end