diff --git a/src/lib/tpm2_tlcl.c b/src/lib/tpm2_tlcl.c
index 6f5243e..6c0cd6e 100644
--- a/src/lib/tpm2_tlcl.c
+++ b/src/lib/tpm2_tlcl.c
@@ -369,3 +369,19 @@
 		return TPM_E_INTERNAL_INCONSISTENCY;
 	}
 }
+
+uint32_t tlcl_disable_platform_hierarchy(void)
+{
+	struct tpm2_response *response;
+	struct tpm2_hierarchy_control_cmd hc = {
+		.enable = TPM_RH_PLATFORM,
+		.state = 0,
+	};
+
+	response = tpm_process_command(TPM2_Hierarchy_Control, &hc);
+
+	if (!response || response->hdr.tpm_code)
+		return TPM_E_INTERNAL_INCONSISTENCY;
+
+	return TPM_SUCCESS;
+}