diff --git a/plugins/Debian.py b/plugins/Debian.py
index e432031f9..10b300ee3 100644
--- a/plugins/Debian.py
+++ b/plugins/Debian.py
@@ -66,7 +66,7 @@ def configure(advanced):
                       to run the file command.  I'll disable this command
                       now.  When you get zegrep in your path, use the command
                       "enable file" to re-enable the command.""")
-            conf.supybot.defaultCapabilities().add('Debian.file')
+            conf.supybot.defaultCapabilities().add('-Debian.file')
         else:
             output("""I can't find zegrep in your path.  If you want to run
                       the file command with any sort of expediency, you'll
@@ -77,7 +77,7 @@ def configure(advanced):
                 conf.supybot.plugins.Debian.pythonZegrep.setValue(True)
             else:
                 output('I\'ll disable file now.')
-                conf.supybot.defaultCapabilities().add('Debian.file')
+                conf.supybot.defaultCapabilities().add('-Debian.file')
 
 conf.registerPlugin('Debian')
 conf.registerGlobalValue(conf.supybot.plugins.Debian, 'pythonZegrep',
diff --git a/plugins/Unix.py b/plugins/Unix.py
index 90b00485a..e8e9268a0 100644
--- a/plugins/Unix.py
+++ b/plugins/Unix.py
@@ -65,14 +65,14 @@ def configure(advanced):
                   function of this module will not work.  You may choose to
                   install it later.  To re-enable this command then, remove
                   the "disable spell" line from your configuration file.""")
-        conf.supybot.defaultCapabilities().add('Unix.spell')
+        conf.supybot.defaultCapabilities().add('-Unix.spell')
     fortuneCmd = utils.findBinaryInPath('fortune')
     if not fortuneCmd:
         output("""NOTE: I couldn't find fortune in your path, so that function
                   of this module will not work.  You may choose to install it
                   later.  To re-enable this command then, remove the
                   '"disable fortune" command from your configuration file.""")
-        conf.supybot.defaultCapabilities().add('Unix.fortune')
+        conf.supybot.defaultCapabilities().add('-Unix.fortune')
     wtfCmd = utils.findBinaryInPath('wtf')
     if not wtfCmd:
         output("""NOTE: I couldn't find wtf in your path, so that function of
@@ -80,14 +80,14 @@ def configure(advanced):
                   to re-enable this command then, remove the "disable wtf"
                   command from your configuration file or simply tell the bot
                   "enable wtf" instead.""")
-        conf.supybot.defaultCapabilities().add('Unix.wtf')
+        conf.supybot.defaultCapabilities().add('-Unix.wtf')
     output("""The "progstats" command can reveal potentially sensitive
               information about your machine. Here's an example of its output:
 
               %s\n""" % progstats())
     if yn('Would you like to disable this command for non-owner users?',
           default=True):
-        conf.supybot.defaultCapabilities().add('Unix.progstats')
+        conf.supybot.defaultCapabilities().add('-Unix.progstats')
 
 def progstats():
     pw = pwd.getpwuid(os.getuid())