diff --git a/snowex_db/string_management.py b/snowex_db/string_management.py
index bdefa16..2b92cee 100644
--- a/snowex_db/string_management.py
+++ b/snowex_db/string_management.py
@@ -209,7 +209,7 @@ def parse_none(value):
     if isinstance(value, str):
         if value.lower() in ['nan', 'none', '-9999', '-9999.0'] or not value:
             result = None
-    elif isinstance(value, float):
+    elif isinstance(value, float) or isinstance(value, int):
         if np.isnan(value) or value == -9999:
             result = None
 
diff --git a/tests/data/density.csv b/tests/data/density.csv
index 72d1adc..09cd7f6 100644
--- a/tests/data/density.csv
+++ b/tests/data/density.csv
@@ -6,7 +6,7 @@
 # Easting,743281
 # Northing,4324005
 # top (cm),bottom (cm),density A (kg/m3),density B (kg/m3),density C (kg/m3)
-35.0,25.0,190.0,245.0,NaN
-25.0,15.0,228.0,241.0,NaN
-15.0,5.0,217.0,253.0,NaN
-12.0,2.0,236.0,NaN,NaN
+35.0,25.0,190.0,245.0,-9999
+25.0,15.0,228.0,241.0,-9999
+15.0,5.0,217.0,253.0,-9999
+12.0,2.0,236.0,NaN,-9999
diff --git a/tests/test_string_management.py b/tests/test_string_management.py
index 6e030a6..aa0a4fc 100644
--- a/tests/test_string_management.py
+++ b/tests/test_string_management.py
@@ -1,3 +1,4 @@
+import numpy as np
 import pytest
 from snowex_db.string_management import *
 
@@ -62,18 +63,25 @@ def test_strip_encapsulated(s, encaps, expected):
     assert r == expected
 
 
-def test_parse_none():
+@pytest.mark.parametrize('str_value, expected', [
+    # Expected nones
+    ('NaN', None),
+    ('NONE', None),
+    (-9999, None),  # integer case
+    ('-9999', None),
+    ('-9999.0', None),
+    (-9999.0, None),
+    (np.nan, None),
+    # Shouldn't modify anything
+    (10.5, 10.5),
+    ("Comment", "Comment"),
+])
+def test_parse_none(str_value, expected):
     """
     Test we can convert nones and nans to None and still pass through everything
     else.
     """
-    # Assert these are converted to None
-    for v in ['NaN', '', 'NONE', np.nan]:
-        assert parse_none(v) is None
-
-    # Assert these are unaffected by function
-    for v in [10.5, 'Comment']:
-        assert parse_none(v) == v
+    assert parse_none(str_value) == expected
 
 
 @pytest.mark.parametrize('args, kwargs, expected', [