diff --git a/libmproxy/console/grideditor.py b/libmproxy/console/grideditor.py
index fa5142f392..bbdde4e3e9 100644
--- a/libmproxy/console/grideditor.py
+++ b/libmproxy/console/grideditor.py
@@ -1,7 +1,7 @@
 import copy, re, os
 import urwid
 import common
-from .. import utils, filt
+from .. import utils, filt, script
 from netlib import http_uastrings
 
 
@@ -486,8 +486,9 @@ class PathEditor(GridEditor):
 class ScriptEditor(GridEditor):
     title = "Editing scripts"
     columns = 1
-    headings = ("Path",)
+    headings = ("Command",)
     def is_error(self, col, val):
-        return False
-
-
+        try:
+            script.Script.parse_command(val)
+        except script.ScriptError, v:
+            return str(v)
diff --git a/libmproxy/script.py b/libmproxy/script.py
index a80f4694d3..0912c9ae62 100644
--- a/libmproxy/script.py
+++ b/libmproxy/script.py
@@ -47,11 +47,21 @@ class Script:
     """
     def __init__(self, command, master):
         self.command = command
-        self.argv = shlex.split(command, posix=(os.name != "nt"))
+        self.argv = self.parse_command(command)
         self.ctx = ScriptContext(master)
         self.ns = None
         self.load()
 
+    @classmethod
+    def parse_command(klass, command):
+        args = shlex.split(command, posix=(os.name != "nt"))
+        args[0] = os.path.expanduser(args[0])
+        if not os.path.exists(args[0]):
+            raise ScriptError("Command not found.")
+        elif not os.path.isfile(args[0]):
+            raise ScriptError("Not a file: %s" % args[0])
+        return args
+
     def load(self):
         """
             Loads a module.
@@ -59,14 +69,9 @@ def load(self):
             Raises ScriptError on failure, with argument equal to an error
             message that may be a formatted traceback.
         """
-        path = os.path.expanduser(self.argv[0])
-        if not os.path.exists(path):
-            raise ScriptError("No such file: %s" % path)
-        if not os.path.isfile(path):
-            raise ScriptError("Not a file: %s" % path)
         ns = {}
         try:
-            execfile(path, ns, ns)
+            execfile(self.argv[0], ns, ns)
         except Exception, v:
             raise ScriptError(traceback.format_exc(v))
         self.ns = ns
diff --git a/test/test_script.py b/test/test_script.py
index 39aa12e9c0..025e9f377e 100644
--- a/test/test_script.py
+++ b/test/test_script.py
@@ -40,7 +40,7 @@ def test_err(self):
         fm = flow.FlowMaster(None, s)
 
         tutils.raises(
-            "no such file",
+            "not found",
             script.Script, "nonexistent", fm
         )