diff --git a/components/ssd1306/ssd1306_i2c.c b/components/ssd1306/ssd1306_i2c.c
index 09407a4..1b8eabc 100644
--- a/components/ssd1306/ssd1306_i2c.c
+++ b/components/ssd1306/ssd1306_i2c.c
@@ -13,7 +13,9 @@
 #define I2C_NUM I2C_NUM_0
 //#define I2C_NUM I2C_NUM_1
 
-#define I2C_MASTER_FREQ_HZ 400000 /*!< I2C master clock frequency. no higher than 1MHz for now */
+//#define I2C_MASTER_FREQ_HZ 400000 /*!< I2C master clock frequency. no higher than 1MHz for now */
+#define I2C_MASTER_FREQ_HZ 800000 /*!< I2C master clock frequency. no higher than 1MHz for now */
+//#define I2C_MASTER_FREQ_HZ 1000000 /*!< I2C master clock frequency. no higher than 1MHz for now */
 
 void i2c_master_init(SSD1306_t * dev, int16_t sda, int16_t scl, int16_t reset)
 {