diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 4af27ae7b35a..1db88c216388 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -451,7 +451,7 @@ static ssize_t out_mode_store(struct device *dev,
 
 	if (strlen(buf) >= 10)
 		return -EINVAL;
-	if (sscanf(buf, "%10s", str) != 1)
+	if (sscanf(buf, "%s", str) != 1)
 		return -EINVAL;
 	ret = tmc_etr_switch_mode(drvdata, str);
 	return ret ? ret : size;