diff --git a/test.sh b/test.sh
index 734fbca..e7e982a 100755
--- a/test.sh
+++ b/test.sh
@@ -7,7 +7,7 @@ cd "$(dirname "${BASH_SOURCE[0]}")/2020"
 run_solution() {
 	if [ -d "$solution" ]; then
 		runfile=$solution/run.sh
-		[ -f "$runfile" ] || { echo "Error: $runfile not found"; exit 1; }
+		[ -f "$runfile" ] || { echo "Error: $runfile not found" >&2; exit 1; }
 		"$runfile" "$input"
 	else
 		case "$(basename "$solution")" in
@@ -18,7 +18,7 @@ run_solution() {
 				python "$solution" < "$input"
 				;;
 			*)
-				echo "Error: Unknown solution type: $solution"
+				echo "Error: Unknown solution type: $solution" >&2
 				exit 1
 				;;
 		esac