diff --git a/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal b/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal
index 1a6b75a70..cab2225de 100644
--- a/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal	
+++ b/OSBindings/Mac/Clock Signal/ScanTarget/ScanTarget.metal	
@@ -70,8 +70,10 @@ struct Scan {
 		uint16_t cyclesSinceRetrace;
 	} endPoints[2];
 
-	uint8_t compositeAmplitude;
-	uint8_t __alignment[3];			// TODO: reuse some padding as the next two fields, to save two bytes.
+	union {
+		uint8_t compositeAmplitude;
+		uint32_t padding;			// TODO: reuse some padding as the next two fields, to save two bytes.
+	};
 	uint16_t dataY;
 	uint16_t line;
 };