diff --git a/samples/drivers/adc/sample.yaml b/samples/drivers/adc/sample.yaml
index c643de513ce..83112fd4dad 100644
--- a/samples/drivers/adc/sample.yaml
+++ b/samples/drivers/adc/sample.yaml
@@ -15,4 +15,4 @@ tests:
       type: multi_line
       regex:
         - "ADC reading:"
-        - " - .+, channel \\d+: \\d+"
+        - "- .+, channel \\d+: -?\\d+"
diff --git a/samples/drivers/adc/src/main.c b/samples/drivers/adc/src/main.c
index d4b2f77331b..0d74e6abb73 100644
--- a/samples/drivers/adc/src/main.c
+++ b/samples/drivers/adc/src/main.c
@@ -141,7 +141,7 @@ void main(void)
 	while (1) {
 		printk("ADC reading:\n");
 		for (uint8_t i = 0; i < ARRAY_SIZE(adc_channels); i++) {
-			printk(" - %s, channel %d: ",
+			printk("- %s, channel %d: ",
 				adc_labels[i], adc_channels[i].channel_id);
 
 			prepare_sequence(&sequence, &adc_channels[i]);