diff --git a/spec/images/invalid1.png b/spec/images/invalid1.png
deleted file mode 100644
index 436d87eb..00000000
Binary files a/spec/images/invalid1.png and /dev/null differ
diff --git a/spec/save_images_spec.rb b/spec/save_images_spec.rb
index b4f89774..9284c456 100644
--- a/spec/save_images_spec.rb
+++ b/spec/save_images_spec.rb
@@ -76,16 +76,21 @@
       it "creates a dummy invalid image" do
         allow(saving).to receive(:attempt_image_capture).and_raise("boom")
         # Create the image at the original res of the invalid image, so that we
-        # can compare it's md5 easily
+        # can compare its md5 easily
         jobs = [
           ['test', '/test/path', '1500x1500', test_url1, test_image1, nil, nil, nil,
            'invalid1.jpg']
         ]
         saving.parallel_task(jobs)
-        # Test fixture image created from the original invalid image because
-        # the original is a jpg
-        invalid_image = get_path_relative_to __FILE__, "./images/invalid1.png"
-        invalid_md5 = Digest::MD5.hexdigest(File.read(invalid_image))
+        # Create the expected image so we can compare them, because they'll
+        # differ between imagemagick versions and platforms and so we can't just
+        # use a fixture.
+        saving.create_invalid_image(
+          "shots/test/invalid1.png",
+          1500,
+          "invalid1.jpg"
+        )
+        invalid_md5 = Digest::MD5.hexdigest(File.read("shots/test/invalid1.png"))
         created_md5 = Digest::MD5.hexdigest(File.read(test_image1))
         expect(created_md5).to eq invalid_md5
       end