diff --git a/src/main.c b/src/main.c
index a987bbe..cc1cdf0 100644
--- a/src/main.c
+++ b/src/main.c
@@ -702,6 +702,7 @@ int main(void)
 		while(!dma_get_interrupt_flag(DMA1, DMA_CHANNEL1, DMA_TCIF) && wait_frame);
 		dma_clear_interrupt_flags(DMA1, DMA_CHANNEL1, DMA_TCIF);
 
+#ifdef DEBUG
 		if(timebase_ms % 250 == 0) {
 			debug_send_string("ADC: ");
 			for(int i = 0; i < ADC_NUM_CHANNELS; i++) {
@@ -711,6 +712,7 @@ int main(void)
 			}
 			debug_send_string("\r\n");
 		}
+#endif
 
 		// convert read values
 		power_state.vin     = fxp_mult(fxp_from_int(adc_values[0]), VIN_SCALE);