diff --git a/Tests/images/cmx3g8_wv_1998.260_0745_mcidas.tiff b/Tests/images/cmx3g8_wv_1998.260_0745_mcidas.tiff
index b72509cc4..2ebb287e2 100644
Binary files a/Tests/images/cmx3g8_wv_1998.260_0745_mcidas.tiff and b/Tests/images/cmx3g8_wv_1998.260_0745_mcidas.tiff differ
diff --git a/Tests/test_file_mcidas.py b/Tests/test_file_mcidas.py
index e11e6bb52..7e236028d 100644
--- a/Tests/test_file_mcidas.py
+++ b/Tests/test_file_mcidas.py
@@ -27,6 +27,6 @@ def test_valid_file() -> None:
 
         # Assert
         assert im.format == "MCIDAS"
-        assert im.mode == "I"
+        assert im.mode == "I;16B"
         assert im.size == (1800, 400)
         assert_image_equal_tofile(im, saved_file)
diff --git a/src/PIL/McIdasImagePlugin.py b/src/PIL/McIdasImagePlugin.py
index 4c34dd7e5..9a47933b6 100644
--- a/src/PIL/McIdasImagePlugin.py
+++ b/src/PIL/McIdasImagePlugin.py
@@ -50,9 +50,7 @@ class McIdasImageFile(ImageFile.ImageFile):
         if w[11] == 1:
             mode = rawmode = "L"
         elif w[11] == 2:
-            # FIXME: add memory map support
-            mode = "I"
-            rawmode = "I;16B"
+            mode = rawmode = "I;16B"
         elif w[11] == 4:
             # FIXME: add memory map support
             mode = "I"