diff --git a/src/main.rs b/src/main.rs
index ddb907a..c7f1c56 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -386,7 +386,7 @@ mod test {
         let compressed = [
             (QOI_OP_LUMA | 0b0011_1111),
             (0b1111_1111), // Diff( 31, 7,  7) -> Pix (38, 31, 38)
-            (QOI_OP_LUMA | 0b0011_0000),
+            (QOI_OP_LUMA | 0b0010_0000),
             (0b1000_1000), // Diff(  0, 0,  0) -> Pix (0, 0, 0)
             (QOI_OP_LUMA | 0b0010_0001),
             (0b1111_1111), // Diff(  1, 7,  7) -> Pix (8, 1, 8)