diff --git a/components/audio_router/audio_router.c b/components/audio_router/audio_router.c
index 7037547..39e17ed 100644
--- a/components/audio_router/audio_router.c
+++ b/components/audio_router/audio_router.c
@@ -41,7 +41,7 @@ static TaskHandle_t         s_task      = NULL;
 
 /* --- Gain numerique SCO (avec saturation) --- */
 #define SCO_PLAY_GAIN 4   /* downlink : PCM mobile -> ecouteur */
-#define SCO_MIC_GAIN  2   /* uplink   : micro -> mobile */
+#define SCO_MIC_GAIN  3   /* uplink   : micro -> mobile */
 static inline int16_t sat16(int32_t v)
 {
     if (v > 32767) return 32767;