diff --git a/pkg/signer/signer.go b/pkg/signer/signer.go
index b6ceef76..2da3912a 100644
--- a/pkg/signer/signer.go
+++ b/pkg/signer/signer.go
@@ -23,6 +23,12 @@ import (
 
 	"github.com/sigstore/sigstore/pkg/signature"
 	"github.com/sigstore/sigstore/pkg/signature/kms"
+
+	// Register the provider-specific plugins
+	_ "github.com/sigstore/sigstore/pkg/signature/kms/aws"
+	_ "github.com/sigstore/sigstore/pkg/signature/kms/azure"
+	_ "github.com/sigstore/sigstore/pkg/signature/kms/gcp"
+	_ "github.com/sigstore/sigstore/pkg/signature/kms/hashivault"
 )
 
 const KMSScheme = "kms"