diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
index 1b0adab397..af62f03b0f 100644
--- a/src/shared/tpm2-util.c
+++ b/src/shared/tpm2-util.c
@@ -1496,7 +1496,7 @@ int tpm2_seal(const char *device,
                         .nameAlg = TPM2_ALG_SHA256,
                         .objectAttributes = TPMA_OBJECT_FIXEDTPM | TPMA_OBJECT_FIXEDPARENT,
                         .parameters.keyedHashDetail.scheme.scheme = TPM2_ALG_NULL,
-                        .unique.keyedHash.size = 32,
+                        .unique.keyedHash.size = SHA256_DIGEST_SIZE,
                         .authPolicy = *policy_digest,
                 },
         };