diff --git a/test/unit/run.c b/test/unit/run.c
index 24624aea9..84b867be5 100644
--- a/test/unit/run.c
+++ b/test/unit/run.c
@@ -125,8 +125,7 @@ static void _print_path_delta(FILE *stream,
 			fprintf(stream, "\n");
 	}
 
-	if (new_len > 0)
-		len = common_prefix * 2 + (new[new_len - 1].e - new[new_len - 1].b);
+	len = (new_len > 0) ? common_prefix * 2 + (new[new_len - 1].e - new[new_len - 1].b) : 0;
 
 	fprintf(stream, "  ");
 	for (d = len; d < 60; d++)