diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
index 3f517d5919..1a3c162624 100644
--- a/src/shared/tpm2-util.c
+++ b/src/shared/tpm2-util.c
@@ -5008,6 +5008,7 @@ static const char* const pcr_index_table[_PCR_INDEX_MAX_DEFINED] = {
         [PCR_EXTERNAL_CONFIG]     = "external-config",
         [PCR_BOOT_LOADER_CODE]    = "boot-loader-code",
         [PCR_BOOT_LOADER_CONFIG]  = "boot-loader-config",
+        [PCR_HOST_PLATFORM]       = "host-platform",
         [PCR_SECURE_BOOT_POLICY]  = "secure-boot-policy",
         [PCR_KERNEL_INITRD]       = "kernel-initrd",
         [PCR_IMA]                 = "ima",
diff --git a/src/shared/tpm2-util.h b/src/shared/tpm2-util.h
index 32da247c37..23a97f15ff 100644
--- a/src/shared/tpm2-util.h
+++ b/src/shared/tpm2-util.h
@@ -272,11 +272,11 @@ int tpm2_parse_luks2_json(JsonVariant *v, int *ret_keyslot, uint32_t *ret_hash_p
 
 int tpm2_hash_alg_to_size(uint16_t alg);
 
-const char *tpm2_hash_alg_to_string(uint16_t alg);
-int tpm2_hash_alg_from_string(const char *alg);
+const char *tpm2_hash_alg_to_string(uint16_t alg) _const_;
+int tpm2_hash_alg_from_string(const char *alg) _pure_;
 
-const char *tpm2_asym_alg_to_string(uint16_t alg);
-int tpm2_asym_alg_from_string(const char *alg);
+const char *tpm2_asym_alg_to_string(uint16_t alg) _const_;
+int tpm2_asym_alg_from_string(const char *alg) _pure_;
 
 char *tpm2_pcr_mask_to_string(uint32_t mask);
 
@@ -308,6 +308,7 @@ enum {
         PCR_EXTERNAL_CONFIG     = 3,
         PCR_BOOT_LOADER_CODE    = 4,
         PCR_BOOT_LOADER_CONFIG  = 5,
+        PCR_HOST_PLATFORM       = 6,
         PCR_SECURE_BOOT_POLICY  = 7,
         /* The following names for PCRs 9…15 are based on the "Linux TPM PCR Registry"
         (https://uapi-group.org/specifications/specs/linux_tpm_pcr_registry/) */