diff --git a/blender_asset_tracer/blendfile/__init__.py b/blender_asset_tracer/blendfile/__init__.py
index f698f32..361efe6 100644
--- a/blender_asset_tracer/blendfile/__init__.py
+++ b/blender_asset_tracer/blendfile/__init__.py
@@ -94,6 +94,7 @@ class BlendFile:
             fileobj.close()
             self.fileobj = tmpfile
         elif magic != BLENDFILE_MAGIC:
+            fileobj.close()
             raise exceptions.BlendFileError("File is not a blend file", path)
 
         self.header = header.BlendFileHeader(self.fileobj, self.raw_filepath)
diff --git a/tests/test_blendfile_loading.py b/tests/test_blendfile_loading.py
index 5fc4f8a..2baeccc 100644
--- a/tests/test_blendfile_loading.py
+++ b/tests/test_blendfile_loading.py
@@ -1,7 +1,9 @@
 import os
+import pathlib
+import unittest
 
 from blender_asset_tracer import blendfile
-from blender_asset_tracer.blendfile import iterators
+from blender_asset_tracer.blendfile import iterators, exceptions
 from abstract_test import AbstractBlendFileTest
 
 
@@ -206,3 +208,9 @@ class LoadCompressedTest(AbstractBlendFileTest):
         ob = self.bf.code_index[b'OB'][0]
         name = ob.get((b'id', b'name'))
         self.assertEqual('OBümlaut', name)
+
+
+class LoadNonBlendfileTest(unittest.TestCase):
+    def test_loading(self):
+        with self.assertRaises(exceptions.BlendFileError):
+            blendfile.BlendFile(pathlib.Path(__file__))