diff --git a/ports/stm32/machine_i2s.c b/ports/stm32/machine_i2s.c
index 2120554c3a..2bb60a6a86 100644
--- a/ports/stm32/machine_i2s.c
+++ b/ports/stm32/machine_i2s.c
@@ -158,7 +158,7 @@ STATIC mp_obj_t machine_i2s_deinit(mp_obj_t self_in);
 STATIC const int8_t i2s_frame_map[NUM_I2S_USER_FORMATS][I2S_RX_FRAME_SIZE_IN_BYTES] = {
     { 0,  1, -1, -1, -1, -1, -1, -1 },  // Mono, 16-bits
     { 2,  3,  0,  1, -1, -1, -1, -1 },  // Mono, 32-bits
-    { 0,  1,  4,  5, -1, -1, -1, -1 },  // Stereo, 16-bits
+    { 0,  1, -1, -1,  2,  3, -1, -1 },  // Stereo, 16-bits
     { 2,  3,  0,  1,  6,  7,  4,  5 },  // Stereo, 32-bits
 };