diff --git a/library/pk_wrap.c b/library/pk_wrap.c
index e67138b..4a3fef7 100644
--- a/library/pk_wrap.c
+++ b/library/pk_wrap.c
@@ -262,9 +262,11 @@
     mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
     size_t rsa_len = mbedtls_rsa_get_len(rsa);
 
+#if SIZE_MAX > UINT_MAX
     if (md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len) {
         return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
     }
+#endif
 
     if (sig_len < rsa_len) {
         return MBEDTLS_ERR_RSA_VERIFY_FAILED;
@@ -382,9 +384,11 @@
 {
     mbedtls_rsa_context *rsa = (mbedtls_rsa_context *) pk->pk_ctx;
 
+#if SIZE_MAX > UINT_MAX
     if (md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len) {
         return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
     }
+#endif
 
     *sig_len = mbedtls_rsa_get_len(rsa);
     if (sig_size < *sig_len) {
@@ -1565,9 +1569,11 @@
 {
     mbedtls_rsa_alt_context *rsa_alt = pk->pk_ctx;
 
+#if SIZE_MAX > UINT_MAX
     if (UINT_MAX < hash_len) {
         return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
     }
+#endif
 
     *sig_len = rsa_alt->key_len_func(rsa_alt->key);
     if (*sig_len > MBEDTLS_PK_SIGNATURE_MAX_SIZE) {