diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 2391006..c516e38 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -1330,7 +1330,7 @@
     if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_ENCRYPT 
                         | PSA_KEY_USAGE_DECRYPT | PSA_KEY_USAGE_SIGN 
                         | PSA_KEY_USAGE_VERIFY ) ) != 0 )
-        return( PSA_ERROR_INVALID_KEY_POLICY );
+        return( PSA_ERROR_INVALID_ARGUMENT );
 
     slot->policy = *policy;