diff --git a/lib/command.js b/lib/command.js
index 2d1241a8..36d89d57 100644
--- a/lib/command.js
+++ b/lib/command.js
@@ -159,7 +159,7 @@
       persistent: true,
       interval: 500
     }, function(curr, prev) {
-      if (curr.mtime.getTime() === prev.mtime.getTime()) {
+      if (curr.size === prev.size && curr.mtime.getTime() === prev.mtime.getTime()) {
         return null;
       }
       return fs.readFile(source, function(err, code) {
diff --git a/src/command.coffee b/src/command.coffee
index c136e7a7..223218b8 100644
--- a/src/command.coffee
+++ b/src/command.coffee
@@ -133,7 +133,7 @@ compileStdio = ->
 # such as `--lint` or `--print`.
 watch = (source, base) ->
   fs.watchFile source, {persistent: true, interval: 500}, (curr, prev) ->
-    return if curr.mtime.getTime() is prev.mtime.getTime()
+    return if curr.size is prev.size and curr.mtime.getTime() is prev.mtime.getTime()
     fs.readFile source, (err, code) ->
       throw err if err
       compileScript(source, code.toString(), base)