diff --git a/cores/esp8266/core_esp8266_i2s.cpp b/cores/esp8266/core_esp8266_i2s.cpp
index a18d9a3cc4..c50d5e2d8e 100644
--- a/cores/esp8266/core_esp8266_i2s.cpp
+++ b/cores/esp8266/core_esp8266_i2s.cpp
@@ -502,7 +502,7 @@ void i2s_set_dividers(uint8_t div1, uint8_t div2) {
 }
 
 float i2s_get_real_rate(){
-  return (float)I2SBASEFREQ/32/((I2SC>>I2SBD) & I2SBDM)/((I2SC >> I2SCD) & I2SCDM);
+  return (float)I2SBASEFREQ/(_i2s_bits * 2)/((I2SC>>I2SBD) & I2SBDM)/((I2SC >> I2SCD) & I2SCDM);
 }
 
 bool i2s_rxtx_begin(bool enableRx, bool enableTx) {