diff --git a/.github/workflows/longevity_test.yml b/.github/workflows/longevity_test.yml
index 13eacdbbe..8d7a3f55a 100644
--- a/.github/workflows/longevity_test.yml
+++ b/.github/workflows/longevity_test.yml
@@ -352,14 +352,14 @@ jobs:
             #   - x - index blobs
             ./s3checker \
               --bucket ${{ secrets.CI_RETENTION_TESTS_S3_BUCKET }} \
-              --bucket-prefix ${{ env.PREFIX }} \
+              --prefix ${{ env.PREFIX }} \
               --retention-mode ${{ env.RETENTION_MODE }} \
               --live-retention-duration "$((${{ env.RETENTION_DURATION }}-1))h" \
-              --prefix "kopia.blobcfg" \
-              --prefix "kopia.repository" \
-              --prefix "p" \
-              --prefix "q" \
-              --prefix "x"
+              --object-prefix "kopia.blobcfg" \
+              --object-prefix "kopia.repository" \
+              --object-prefix "p" \
+              --object-prefix "q" \
+              --object-prefix "x"
           fi
 
       ##########################################################################
diff --git a/src/cmd/s3checker/s3checker.go b/src/cmd/s3checker/s3checker.go
index c2fdf5a7f..6413f7d83 100644
--- a/src/cmd/s3checker/s3checker.go
+++ b/src/cmd/s3checker/s3checker.go
@@ -52,12 +52,12 @@ func checkerCommand() (*cobra.Command, error) {
 		"Name of bucket to check")
 	fs.StringVar(
 		&f.bucketPrefix,
-		"bucket-prefix",
+		"prefix",
 		"",
 		"Prefix to add to all object lookups")
 	fs.StringSliceVar(
 		&f.prefixes,
-		"prefix",
+		"object-prefix",
 		nil,
 		"Set of object prefixes to check. Pass multiple times for multiple prefixes")