diff --git a/bib/cmd/bootc-image-builder/main.go b/bib/cmd/bootc-image-builder/main.go
index 035e4c0d..a49afed3 100644
--- a/bib/cmd/bootc-image-builder/main.go
+++ b/bib/cmd/bootc-image-builder/main.go
@@ -311,7 +311,7 @@ func manifestFromCobra(cmd *cobra.Command, args []string) ([]byte, *mTLSConfig,
 		return nil, nil, err
 	}
 
-	mTLS, err := extractTLSKeys(container, repos)
+	mTLS, err := extractTLSKeys(SimpleFileReader{}, repos)
 	if err != nil {
 		return nil, nil, err
 	}
diff --git a/bib/cmd/bootc-image-builder/mtls.go b/bib/cmd/bootc-image-builder/mtls.go
index 4dd171c7..101a8e45 100644
--- a/bib/cmd/bootc-image-builder/mtls.go
+++ b/bib/cmd/bootc-image-builder/mtls.go
@@ -19,6 +19,12 @@ type fileReader interface {
 	ReadFile(string) ([]byte, error)
 }
 
+type SimpleFileReader struct{}
+
+func (SimpleFileReader) ReadFile(path string) ([]byte, error) {
+	return os.ReadFile(path)
+}
+
 func extractTLSKeys(reader fileReader, repoSets map[string][]rpmmd.RepoConfig) (*mTLSConfig, error) {
 	var keyPath, certPath, caPath string
 	for _, set := range repoSets {