diff --git a/include/psa/crypto_sizes.h b/include/psa/crypto_sizes.h
index 9ad053629..34664fc10 100644
--- a/include/psa/crypto_sizes.h
+++ b/include/psa/crypto_sizes.h
@@ -292,9 +292,9 @@
      (plaintext_length) - PSA_AEAD_TAG_LENGTH(alg) :              \
      0)
 
-#define PSA_RSA_MINIMUM_PADDING_SIZE(alg)                               \
-    (PSA_ALG_IS_RSA_OAEP(alg) ?                                         \
-     2 * PSA_HASH_FINAL_SIZE(PSA_ALG_RSA_OAEP_GET_HASH(alg)) + 1 :      \
+#define PSA_RSA_MINIMUM_PADDING_SIZE(alg)                         \
+    (PSA_ALG_IS_RSA_OAEP(alg) ?                                   \
+     2 * PSA_HASH_SIZE(PSA_ALG_RSA_OAEP_GET_HASH(alg)) + 1 :      \
      11 /*PKCS#1v1.5*/)
 
 /**