diff --git a/picard/file.py b/picard/file.py
index 101a3b0035..857ee99f7a 100644
--- a/picard/file.py
+++ b/picard/file.py
@@ -826,7 +826,10 @@ def column(self, column):
         if not value and not get_config().setting['clear_existing_tags']:
             value = self.orig_metadata[column]
         if column == '~filesize':
-            value = bytes2human.binary(value)
+            try:
+                value = bytes2human.binary(value)
+            except ValueError:
+                pass
         return value
 
     def _lookup_finished(self, lookuptype, document, http, error):
diff --git a/picard/ui/infodialog.py b/picard/ui/infodialog.py
index c58c7487be..6d34cf1cc1 100644
--- a/picard/ui/infodialog.py
+++ b/picard/ui/infodialog.py
@@ -287,7 +287,10 @@ def format_file_info(file_):
         info.append((_("Format:"), file_.orig_metadata['~format']))
     if '~filesize' in file_.orig_metadata:
         size = file_.orig_metadata['~filesize']
-        sizestr = "%s (%s)" % (bytes2human.decimal(size), bytes2human.binary(size))
+        try:
+            sizestr = "%s (%s)" % (bytes2human.decimal(size), bytes2human.binary(size))
+        except ValueError:
+            sizestr = _("unknown")
         info.append((_("Size:"), sizestr))
     if file_.orig_metadata.length:
         info.append((_("Length:"), format_time(file_.orig_metadata.length)))