diff --git a/pkg/manifest/raw_bootc.go b/pkg/manifest/raw_bootc.go
index 452679b52e..5684fceb7d 100644
--- a/pkg/manifest/raw_bootc.go
+++ b/pkg/manifest/raw_bootc.go
@@ -99,8 +99,11 @@ func (p *RawBootcImage) serialize() osbuild.Pipeline {
 	if len(p.Users) == 1 && p.Users[0].Key != nil {
 		opts.RootSSHAuthorizedKeys = []string{*p.Users[0].Key}
 	}
+	if len(p.containerSpecs) != 1 {
+		panic(fmt.Sprintf("expected a single container input got %v", p.containerSpecs))
+	}
 	inputs := osbuild.ContainerDeployInputs{
-		Images: osbuild.NewContainersInputForSources(p.containerSpecs),
+		Images: osbuild.NewContainersInputForSingleSource(p.containerSpecs[0]),
 	}
 	devices, mounts, err := osbuild.GenBootupdDevicesMounts(p.filename, p.PartitionTable)
 	if err != nil {