diff --git a/cmd/backup/main.go b/cmd/backup/main.go
index 1b3e74f..b6a7545 100644
--- a/cmd/backup/main.go
+++ b/cmd/backup/main.go
@@ -426,7 +426,7 @@ func (s *script) pruneOldBackups() error {
 			)
 		}
 
-		var matches []os.FileInfo
+		var matches []string
 		for _, candidate := range candidates {
 			fi, err := os.Stat(candidate)
 			if err != nil {
@@ -438,14 +438,14 @@ func (s *script) pruneOldBackups() error {
 			}
 
 			if fi.ModTime().Before(deadline) {
-				matches = append(matches, fi)
+				matches = append(matches, candidate)
 			}
 		}
 
 		if len(matches) != 0 && len(matches) != len(candidates) {
 			var errors []error
 			for _, candidate := range matches {
-				if err := os.Remove(candidate.Name()); err != nil {
+				if err := os.Remove(candidate); err != nil {
 					errors = append(errors, err)
 				}
 			}
diff --git a/test/compose/docker-compose.yml b/test/compose/docker-compose.yml
index 26dbbb9..1646ce6 100644
--- a/test/compose/docker-compose.yml
+++ b/test/compose/docker-compose.yml
@@ -27,8 +27,8 @@ services:
       BACKUP_CRON_EXPRESSION: 0 0 5 31 2 ?
       BACKUP_RETENTION_DAYS: ${BACKUP_RETENTION_DAYS:-7}
       BACKUP_PRUNING_LEEWAY: 5s
+      BACKUP_PRUNING_PREFIX: test
       GPG_PASSPHRASE: 1234secret
-      # BACKUP_PRUNING_PREFIX: test
     volumes:
       - ./local:/archive
       - app_data:/backup/app_data:ro