diff --git a/examples/peripherals/i2s/main/i2s_example_main.c b/examples/peripherals/i2s/main/i2s_example_main.c
index 18c66e34c5..8cab7e7874 100644
--- a/examples/peripherals/i2s/main/i2s_example_main.c
+++ b/examples/peripherals/i2s/main/i2s_example_main.c
@@ -40,7 +40,7 @@ static void setup_triangle_sine_waves(int bits)
     triangle_float = -(pow(2, bits)/2 - 1);
 
     for(i = 0; i < SAMPLE_PER_CYCLE; i++) {
-        sin_float = sin(i * PI / 180.0);
+        sin_float = sin(i * 2 * PI / SAMPLE_PER_CYCLE);
         if(sin_float >= 0)
             triangle_float += triangle_step;
         else
@@ -77,6 +77,7 @@ static void setup_triangle_sine_waves(int bits)
 
     free(samples_data);
 }
+
 void app_main(void)
 {
     //for 36Khz sample rates, we create 100Hz sine wave, every cycle need 36000/100 = 360 samples (4-bytes or 8-bytes each sample)