diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index ece64b1..59c2678 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -5703,6 +5703,10 @@
     if( psa_get_key_bits( attributes ) == 0 )
         return( PSA_ERROR_INVALID_ARGUMENT );
 
+    /* Reject any attempt to create a public key. */
+    if( PSA_KEY_TYPE_IS_PUBLIC_KEY(attributes->core.type) )
+        return( PSA_ERROR_INVALID_ARGUMENT );
+
     status = psa_start_key_creation( PSA_KEY_CREATION_GENERATE, attributes,
                                      &slot, &driver );
     if( status != PSA_SUCCESS )