diff --git a/src/network.rs b/src/network.rs
index e299931..705a441 100644
--- a/src/network.rs
+++ b/src/network.rs
@@ -269,6 +269,10 @@ mod test {
         "PX 0 0 ffffff\nPX 42 42 000000\n"
     )] // The get pixel result is also offseted
     #[case("OFFSET 0 0\nPX 0 42 abcdef\nPX 0 42\n", "PX 0 42 abcdef\n")]
+    #[case(
+        "OFFSET 10 10\nPX 0 0 ffffff\nOFFSET 0 0\nPX 0 0\nPX 10 10\n",
+        "PX 0 0 000000\nPX 10 10 ffffff\n"
+    )]
     #[tokio::test]
     async fn test_setting_pixel(
         #[case] input: &str,
diff --git a/src/parser.rs b/src/parser.rs
index 31b502a..740c1dc 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -175,7 +175,7 @@ pub async fn parse_pixelflut_commands(
                     continue;
                 }
             }
-        } else if current_command & 0x0000_ffff_ffff_ffff == string_to_number(b"OFFSET \0\0") {
+        } else if current_command & 0x00ff_ffff_ffff_ffff == string_to_number(b"OFFSET \0\0") {
             i += 7;
 
             let (x, y, present) = parse_pixel_coordinates(buffer.as_ptr(), &mut i);