diff --git a/spa/plugins/audioconvert/channelmix-ops.c b/spa/plugins/audioconvert/channelmix-ops.c
index 9bfc9dc95..56faa7ea6 100644
--- a/spa/plugins/audioconvert/channelmix-ops.c
+++ b/spa/plugins/audioconvert/channelmix-ops.c
@@ -31,21 +31,9 @@
 #include <spa/support/log.h>
 #include <spa/utils/defs.h>
 
-#define VOLUME_MIN 0.0f
-#define VOLUME_NORM 1.0f
-
 #include "channelmix-ops.h"
 #include "hilbert.h"
 
-
-#define _M(ch)		(1UL << SPA_AUDIO_CHANNEL_ ## ch)
-#define MASK_MONO	_M(FC)|_M(MONO)|_M(UNKNOWN)
-#define MASK_STEREO	_M(FL)|_M(FR)|_M(UNKNOWN)
-#define MASK_QUAD	_M(FL)|_M(FR)|_M(RL)|_M(RR)|_M(UNKNOWN)
-#define MASK_3_1	_M(FL)|_M(FR)|_M(FC)|_M(LFE)
-#define MASK_5_1	_M(FL)|_M(FR)|_M(FC)|_M(LFE)|_M(SL)|_M(SR)|_M(RL)|_M(RR)
-#define MASK_7_1	_M(FL)|_M(FR)|_M(FC)|_M(LFE)|_M(SL)|_M(SR)|_M(RL)|_M(RR)
-
 #define ANY	((uint32_t)-1)
 #define EQ	((uint32_t)-2)