diff --git a/main/audio_codecs/no_audio_codec.h b/main/audio_codecs/no_audio_codec.h
index 510bb8b0..b8b90fb5 100644
--- a/main/audio_codecs/no_audio_codec.h
+++ b/main/audio_codecs/no_audio_codec.h
@@ -4,7 +4,7 @@
 #include "audio_codec.h"
 
 #include <driver/gpio.h>
-
+#include <driver/i2s_pdm.h>
 class NoAudioCodec : public AudioCodec {
 private:
     virtual int Write(const int16_t* data, int samples) override;
@@ -15,6 +15,8 @@ public:
     NoAudioCodec(int input_sample_rate, int output_sample_rate, gpio_num_t bclk, gpio_num_t ws, gpio_num_t dout, gpio_num_t din);
     // Simplex
     NoAudioCodec(int input_sample_rate, int output_sample_rate, gpio_num_t spk_bclk, gpio_num_t spk_ws, gpio_num_t spk_dout, gpio_num_t mic_sck, gpio_num_t mic_ws, gpio_num_t mic_din);
+    // Simplex_PDM
+    NoAudioCodec(int input_sample_rate, int output_sample_rate, gpio_num_t spk_bclk, gpio_num_t spk_ws, gpio_num_t spk_dout, gpio_num_t mic_sck,  gpio_num_t mic_din);
     virtual ~NoAudioCodec();
 };