diff --git a/Tests/images/hopper_underscore.xbm b/Tests/images/hopper_underscore.xbm
index 79d9fff9a..50d81e526 100644
--- a/Tests/images/hopper_underscore.xbm
+++ b/Tests/images/hopper_underscore.xbm
@@ -1,6 +1,6 @@
-#define hopper_test_width 128
-#define hopper_test_height 128
-static char hopper_test_bits[] = {
+#define hopper_underscore_width 128
+#define hopper_underscore_height 128
+static char hopper_underscore_bits[] = {
   0xFF, 0xFF, 0xFF, 0x1F, 0xF0, 0x3D, 0x80, 0x96, 0xDA, 0xB6, 0xD6, 0x2A, 
   0xA9, 0x6D, 0x25, 0x29, 0xFF, 0xFF, 0xFF, 0xBF, 0xFE, 0x7D, 0xC0, 0xFB, 
   0x69, 0x69, 0xA9, 0xD5, 0x96, 0x96, 0x5E, 0x9A, 0xFF, 0xFF, 0xFF, 0x9F, 
diff --git a/Tests/test_file_xbm.py b/Tests/test_file_xbm.py
index a1f287ad3..5812ac934 100644
--- a/Tests/test_file_xbm.py
+++ b/Tests/test_file_xbm.py
@@ -51,7 +51,7 @@ class TestFileXbm(PillowTestCase):
 
     def test_open_filename_with_underscore(self):
         # Arrange
-        # Created with `cp hopper.xbm hopper_underscore.xbm`
+        # Created with `convert hopper.png hopper_underscore.xbm`
         filename = "Tests/images/hopper_underscore.xbm"
 
         # Act