diff --git a/audio/decode/ad.h b/audio/decode/ad.h
index 3bc3e39267..0bbc11ed9b 100644
--- a/audio/decode/ad.h
+++ b/audio/decode/ad.h
@@ -34,7 +34,7 @@ typedef struct ad_functions
     int (*preinit)(sh_audio_t *sh);
     int (*init)(sh_audio_t *sh, const char *decoder);
     void (*uninit)(sh_audio_t *sh);
-    int (*control)(sh_audio_t *sh,int cmd,void* arg, ...);
+    int (*control)(sh_audio_t *sh, int cmd, void *arg);
     int (*decode_audio)(sh_audio_t *sh, unsigned char *buffer, int minlen,
                         int maxlen);
 } ad_functions_t;
diff --git a/audio/decode/ad_internal.h b/audio/decode/ad_internal.h
index 7eca629fca..61bf306a5e 100644
--- a/audio/decode/ad_internal.h
+++ b/audio/decode/ad_internal.h
@@ -32,7 +32,7 @@ static void add_decoders(struct mp_decoder_list *list);
 static int init(sh_audio_t *sh, const char *decoder);
 static int preinit(sh_audio_t *sh);
 static void uninit(sh_audio_t *sh);
-static int control(sh_audio_t *sh,int cmd,void* arg, ...);
+static int control(sh_audio_t *sh, int cmd, void *arg);
 static int decode_audio(sh_audio_t *sh,unsigned char *buffer,int minlen,int maxlen);
 
 #define LIBAD_EXTERN(x) const ad_functions_t mpcodecs_ad_##x = {\
diff --git a/audio/decode/ad_lavc.c b/audio/decode/ad_lavc.c
index 382d4eacc5..248df307d7 100644
--- a/audio/decode/ad_lavc.c
+++ b/audio/decode/ad_lavc.c
@@ -310,7 +310,7 @@ static void uninit(sh_audio_t *sh)
     sh->context = NULL;
 }
 
-static int control(sh_audio_t *sh, int cmd, void *arg, ...)
+static int control(sh_audio_t *sh, int cmd, void *arg)
 {
     struct priv *ctx = sh->context;
     switch (cmd) {
diff --git a/audio/decode/ad_mpg123.c b/audio/decode/ad_mpg123.c
index 999dc2fbba..c17edc9197 100644
--- a/audio/decode/ad_mpg123.c
+++ b/audio/decode/ad_mpg123.c
@@ -455,7 +455,7 @@ static int decode_audio(sh_audio_t *sh, unsigned char *buf, int minlen,
     return bytes;
 }
 
-static int control(sh_audio_t *sh, int cmd, void *arg, ...)
+static int control(sh_audio_t *sh, int cmd, void *arg)
 {
     switch (cmd) {
     case ADCTRL_RESYNC_STREAM:
diff --git a/audio/decode/ad_spdif.c b/audio/decode/ad_spdif.c
index ad735dde7d..2101721430 100644
--- a/audio/decode/ad_spdif.c
+++ b/audio/decode/ad_spdif.c
@@ -270,7 +270,7 @@ static int decode_audio(sh_audio_t *sh, unsigned char *buf,
     return spdif_ctx->out_buffer_len;
 }
 
-static int control(sh_audio_t *sh, int cmd, void* arg, ...)
+static int control(sh_audio_t *sh, int cmd, void *arg)
 {
     unsigned char *start;
     double pts;