diff --git a/library/pk.c b/library/pk.c
index e93ccfd..da92e2a 100644
--- a/library/pk.c
+++ b/library/pk.c
@@ -621,7 +621,7 @@
 
     /* prepare the key attributes */
     psa_set_key_type( &attributes, key_type );
-    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN );
+    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
     psa_set_key_algorithm( &attributes, PSA_ALG_ECDSA(hash_alg) );
 
     /* import private key into PSA */