diff --git a/cmd/step-ca/main.go b/cmd/step-ca/main.go
index 289815ef..c7ece08f 100644
--- a/cmd/step-ca/main.go
+++ b/cmd/step-ca/main.go
@@ -33,6 +33,7 @@ import (
 	_ "go.step.sm/crypto/kms/pkcs11"
 	_ "go.step.sm/crypto/kms/softkms"
 	_ "go.step.sm/crypto/kms/sshagentkms"
+	_ "go.step.sm/crypto/kms/tpmkms"
 	_ "go.step.sm/crypto/kms/yubikey"
 
 	// Enabled cas interfaces.