diff --git a/Tests/LibGfx/TestImageDecoder.cpp b/Tests/LibGfx/TestImageDecoder.cpp
index 48cd495193..34ca809c03 100644
--- a/Tests/LibGfx/TestImageDecoder.cpp
+++ b/Tests/LibGfx/TestImageDecoder.cpp
@@ -71,6 +71,16 @@ TEST_CASE(test_bmp_top_down)
     TRY_OR_FAIL(expect_single_frame(*plugin_decoder));
 }
 
+TEST_CASE(test_bmp_1bpp)
+{
+    auto file = TRY_OR_FAIL(Core::MappedFile::map(TEST_INPUT("bmp/bitmap.bmp"sv)));
+    EXPECT(Gfx::BMPImageDecoderPlugin::sniff(file->bytes()));
+    auto plugin_decoder = TRY_OR_FAIL(Gfx::BMPImageDecoderPlugin::create(file->bytes()));
+
+    auto frame = TRY_OR_FAIL(expect_single_frame_of_size(*plugin_decoder, { 399, 400 }));
+    EXPECT_EQ(frame.image->begin()[0], 0xff'ff'ff'ff);
+}
+
 TEST_CASE(test_ico_malformed_frame)
 {
     Array test_inputs = {
diff --git a/Tests/LibGfx/test-inputs/bmp/bitmap.bmp b/Tests/LibGfx/test-inputs/bmp/bitmap.bmp
new file mode 100644
index 0000000000..5520b349e5
Binary files /dev/null and b/Tests/LibGfx/test-inputs/bmp/bitmap.bmp differ
diff --git a/Userland/Libraries/LibGfx/ImageFormats/BMPLoader.cpp b/Userland/Libraries/LibGfx/ImageFormats/BMPLoader.cpp
index eca50ef10f..490f0e2437 100644
--- a/Userland/Libraries/LibGfx/ImageFormats/BMPLoader.cpp
+++ b/Userland/Libraries/LibGfx/ImageFormats/BMPLoader.cpp
@@ -979,11 +979,11 @@ static ErrorOr<void> decode_bmp_color_table(BMPLoadingContext& context)
         if (bytes_per_color == 4) {
             if (!streamer.has_u32())
                 return Error::from_string_literal("Cannot read 32 bits");
-            context.color_table.append(streamer.read_u32());
+            context.color_table.append(streamer.read_u32() | 0xff'00'00'00);
         } else {
             if (!streamer.has_u24())
                 return Error::from_string_literal("Cannot read 24 bits");
-            context.color_table.append(streamer.read_u24());
+            context.color_table.append(streamer.read_u24() | 0xff'00'00'00);
         }
     }