diff --git a/ckanext/data_qld/converters.py b/ckanext/data_qld/converters.py
index 4639107b..7f450601 100644
--- a/ckanext/data_qld/converters.py
+++ b/ckanext/data_qld/converters.py
@@ -12,15 +12,21 @@ def filesize_converter(value, context):
     :rtype: int
 
     """
+    if not value:
+        return None
     value = str(value)
     # remove whitespaces
     value = re.sub(' ', '', value)
     # remove commas
     value = re.sub(',', '', value)
+    if not value:
+        return None
     value = value.upper()
 
     # If the size is not all digits then get size converted into bytes
-    if value and re.search(r'^\d+$', value) is None:
+    if re.search(r'^\d+$', value):
+        value = int(value)
+    else:
         value = filesize_bytes(value)
 
     return value
diff --git a/ckanext/data_qld/tests/test_converters.py b/ckanext/data_qld/tests/test_converters.py
new file mode 100644
index 00000000..e2d1d491
--- /dev/null
+++ b/ckanext/data_qld/tests/test_converters.py
@@ -0,0 +1,21 @@
+# encoding: utf-8
+"""Unit tests for ckan/logic/converters.py.
+
+"""
+import six
+from ckanext.data_qld.converters import filesize_converter
+
+
+def test_filesize_converter():
+    test_cases = {' , ': None,
+                  ' ': None,
+                  '': None,
+                  None: None,
+                  '2 kb': 2048,
+                  1024: 1024,
+                  '1024, ': 1024,
+                  '1,000 bytes': 1000,
+                  '1,000 MB': 1048576000,
+                  }
+    for key, value in six.iteritems(test_cases):
+        assert value == filesize_converter(key, {})