diff --git a/library/psa_crypto_mac.c b/library/psa_crypto_mac.c
index dc07d45..3d7f70b 100644
--- a/library/psa_crypto_mac.c
+++ b/library/psa_crypto_mac.c
@@ -452,8 +452,6 @@
                                          uint8_t *mac,
                                          size_t mac_size )
 {
-    if( operation->alg == 0 )
-        return( PSA_ERROR_BAD_STATE );
     if( mac_size < operation->mac_size )
         return( PSA_ERROR_BUFFER_TOO_SMALL );