diff --git a/Components/9918/Implementation/YamahaCommands.hpp b/Components/9918/Implementation/YamahaCommands.hpp
index 0f4b15e87..3783f6c6d 100644
--- a/Components/9918/Implementation/YamahaCommands.hpp
+++ b/Components/9918/Implementation/YamahaCommands.hpp
@@ -55,7 +55,7 @@ struct Colour {
 	}
 
 	bool has_value() const {
-		return (colour & 0x3) == (colour4bpp & 0x3);
+		return (colour & 0xf) == (colour4bpp & 0xf);
 	}
 
 	/// Colour as written by the CPU.