diff --git a/src/parser.c b/src/parser.c
index 5696d4c..b6af5a6 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -450,10 +450,12 @@ static int perform_piezo_sweep(void)
                 k_busy_wait(PIEZO_AVG_INTER_BURST_GAP_US);
             }
 
+            unsigned int key = irq_lock();
             piezo_burst_sw((uint8_t)cfg->cycles);
             k_busy_wait(capture_delay_us);
 
             err = echo_adc_capture(echo_capture, cfg->samples);
+            irq_unlock(key);
             if (err)
             {
                 DBG_PRINTF("[ECHO] capture fail ch=%d avg=%d err=%d\r\n", ch, avg, err);
@@ -537,10 +539,12 @@ static int perform_single_piezo_capture(uint8_t cycles,
             k_busy_wait(PIEZO_AVG_INTER_BURST_GAP_US);
         }
 
+        unsigned int key = irq_lock();
         piezo_burst_sw(cycles);
         k_busy_wait(delay_us);
 
         err = echo_adc_capture(echo_capture, num_samples);
+        irq_unlock(key);
         if (err)
         {
             return ECHO_STATUS_CAPTURE;