diff --git a/src/ov2640/camera.cpp b/src/ov2640/camera.cpp
index aed2948..85d86bb 100644
--- a/src/ov2640/camera.cpp
+++ b/src/ov2640/camera.cpp
@@ -394,12 +394,12 @@ int OV2640::begin(int dma_irq)
 {
     // Initialize peripherals for parallel+I2C camera:
 
-    // XCLK generation (~20.83 MHz)
+    // XCLK generation (~18.71 MHz)
     gpio_set_function(this->config.pin_xclk, GPIO_FUNC_PWM);
     uint slice_num = pwm_gpio_to_slice_num(this->config.pin_xclk);
-    // 6 cycles (0 to 5), 125 MHz / 6 = ~20.83 MHz wrap rate
-    pwm_set_wrap(slice_num, 5);
-    pwm_set_gpio_level(this->config.pin_xclk, 3);
+    // 8 cycles (0 to 7), 150 MHz / 8 = ~18.71 MHz wrap rate
+    pwm_set_wrap(slice_num, 7);
+    pwm_set_gpio_level(this->config.pin_xclk, 4);
     pwm_set_enabled(slice_num, true);
 
     // Init SCCB