diff --git a/tools/logger/convert.c b/tools/logger/convert.c
index 7de47f97075b..4e0a6cdc59ae 100644
--- a/tools/logger/convert.c
+++ b/tools/logger/convert.c
@@ -532,7 +532,7 @@ static void print_entry_params(const struct log_entry_header *dma_log,
 				entry->header.line_idx);
 	} else {
 		if (time_precision >= 0) {
-			const unsigned int ts_width = timestamp_width(time_precision);
+			const uint8_t ts_width = timestamp_width(time_precision);
 
 			fprintf(out_fd, "%s[%*.*f] (%*.*f)%s ",
 				use_colors ? KGRN : "",
diff --git a/tools/logger/convert.h b/tools/logger/convert.h
index 8117e023b2f9..a870c990b9e4 100644
--- a/tools/logger/convert.h
+++ b/tools/logger/convert.h
@@ -41,7 +41,7 @@ struct convert_config {
 	int dump_ldc;
 	int hide_location;
 	int relative_timestamps;
-	uint8_t time_precision;
+	int8_t time_precision;
 	struct snd_sof_uids_header *uids_dict;
 	struct snd_sof_logs_header *logs_header;
 };