diff --git a/cloudcontrol/cli/tagdisplay.py b/cloudcontrol/cli/tagdisplay.py
index 7ada5d1e3e684a8df6196fe6cce7d000ef465543..914d38cd500b11c5b652f0fd2dace056ccb7f9b9 100644
--- a/cloudcontrol/cli/tagdisplay.py
+++ b/cloudcontrol/cli/tagdisplay.py
@@ -138,14 +138,22 @@ class TagDisplay(object):
 
     def type_bit(self, value):
         '''Bit type'''
-        if value.isdecimal():
-            v = float(value)
+        if value.startswith('-'):
+            value_without_minus = value[1:]
+            neg = True
+        else:
+            value_without_minus = value
+            neg = False
+        if value_without_minus.isdecimal():
+            v = float(value_without_minus)
             if v >= 1000:
                 si = "KMGTPEZY"
                 p = min(math.floor(math.log(abs(v), 2)/10.0), pow(2, len(si)))
                 d = v / pow(2, 10*p)
                 u = si[int(p-1)]
                 value =  u"%.4g%si"%(d, u)
+                if neg:
+                    value =  u"-" + value
         return value
 
     def type_second(self, value):