diff --git a/libaf/af_format.h b/libaf/af_format.h
index e5e5c1cb05..66a74c901e 100644
--- a/libaf/af_format.h
+++ b/libaf/af_format.h
@@ -59,7 +59,7 @@
 #define AF_FORMAT_MU_LAW	(1<<6)
 #define AF_FORMAT_A_LAW		(2<<6)
 #define AF_FORMAT_MPEG2		(3<<6) // MPEG(2) audio
-#define AF_FORMAT_AC3		((4<<6)|AF_FORMAT_16BIT) // Dolby Digital AC3
+#define AF_FORMAT_AC3		(4<<6) // Dolby Digital AC3
 #define AF_FORMAT_IMA_ADPCM	(5<<6)
 #define AF_FORMAT_SPECIAL_MASK	(7<<6)