diff --git a/django/template/defaultfilters.py b/django/template/defaultfilters.py
index 0ba16bc9a5..e6492dcd38 100644
--- a/django/template/defaultfilters.py
+++ b/django/template/defaultfilters.py
@@ -799,7 +799,7 @@ def filesizeformat(bytes):
     """
     try:
         bytes = float(bytes)
-    except TypeError:
+    except (TypeError,ValueError,UnicodeDecodeError):
         return u"0 bytes"
 
     if bytes < 1024:
diff --git a/tests/regressiontests/defaultfilters/tests.py b/tests/regressiontests/defaultfilters/tests.py
index 4343586c48..0fe4673063 100644
--- a/tests/regressiontests/defaultfilters/tests.py
+++ b/tests/regressiontests/defaultfilters/tests.py
@@ -476,6 +476,15 @@ u'1024.0 MB'
 >>> filesizeformat(1024*1024*1024)
 u'1.0 GB'
 
+>>> filesizeformat(complex(1,-1))
+u'0 bytes'
+
+>>> filesizeformat("")
+u'0 bytes'
+
+>>> filesizeformat(u"\N{GREEK SMALL LETTER ALPHA}")
+u'0 bytes'
+
 >>> pluralize(1)
 u''