diff --git a/src/buzzer.c b/src/buzzer.c
index e9a313c..65a157b 100644
--- a/src/buzzer.c
+++ b/src/buzzer.c
@@ -31,6 +31,7 @@ void buzzer_on(uint16_t freq_hz)
 	uint32_t divider_x100 = FREQ_BASE / freq_hz; // = 100 * 125e6 / 512 / freq_hz
 
 	pwm_set_clkdiv_int_frac(m_slice_num, divider_x100 / 100, divider_x100 % 100);
+	gpio_set_function(BUZZER_PIN, GPIO_FUNC_PWM);
 	pwm_set_enabled(m_slice_num, true);
 }