diff --git a/build/devices/esp32/targets/m5stack_cores3/manifest.json b/build/devices/esp32/targets/m5stack_cores3/manifest.json
index e0f8803810..d031ff0de4 100644
--- a/build/devices/esp32/targets/m5stack_cores3/manifest.json
+++ b/build/devices/esp32/targets/m5stack_cores3/manifest.json
@@ -106,6 +106,7 @@
 			"volume_divider": 1,
 			"i2s": {
 				"num": 1,
+				"slot": "I2S_STD_SLOT_LEFT",
 				"bitsPerSample": 16,
 				"bck_pin": 34,
 				"lr_pin": 33,
diff --git a/modules/pins/i2s/audioout.c b/modules/pins/i2s/audioout.c
index 4934b68a4f..756aa42953 100644
--- a/modules/pins/i2s/audioout.c
+++ b/modules/pins/i2s/audioout.c
@@ -78,6 +78,9 @@
 			#define MODDEF_AUDIOOUT_I2S_DAC_CHANNEL 3
 		#endif
 	#endif
+	#ifndef MODDEF_AUDIOOUT_I2S_SLOT
+ 		#define MODDEF_AUDIOOUT_I2S_SLOT I2S_STD_SLOT_RIGHT
+	#endif
 #endif
 
 #if PICO_BUILD
@@ -1509,7 +1512,7 @@ void audioOutLoop(void *pvParameter)
 	i2s_config.slot_cfg.slot_mask = I2S_STD_SLOT_BOTH;
 #else
 	i2s_config.slot_cfg.slot_mode = I2S_SLOT_MODE_MONO;
-	i2s_config.slot_cfg.slot_mask = I2S_STD_SLOT_RIGHT;
+	i2s_config.slot_cfg.slot_mask = MODDEF_AUDIOOUT_I2S_SLOT;;
 #endif
 	i2s_config.slot_cfg.ws_pol = false;
 	i2s_config.slot_cfg.bit_shift = false;