diff --git a/rominfo/gameboy_advance.py b/rominfo/gameboy_advance.py
index a71a679..469535b 100644
--- a/rominfo/gameboy_advance.py
+++ b/rominfo/gameboy_advance.py
@@ -94,7 +94,6 @@ def complement_check(data: BinaryIO) -> str:
         for b in data[0x0A0:0x0BC]:
             checksum = (checksum - b) & 0xFF
 
-        return '{} ({}/{})'.format((checksum - 0x19) & 0xFF == int.from_bytes(data[0x0BD:0x0BE]),
-                                   (checksum - 0x19) & 0xFF, int.from_bytes(data[0x0BD:0x0BE]))
+        return 'OK ({}/{})'.format((checksum - 0x19) & 0xFF, int.from_bytes(data[0x0BD:0x0BE]))
     else:
-        return 'False (Invalid data length)'
+        return 'NOK (Invalid data length)'