diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index ba0755b..2477e58 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -929,6 +929,7 @@
 #define PSA_ALG_SIGN_GET_HASH(alg)                                     \
     (PSA_ALG_IS_RSA_PSS(alg) || PSA_ALG_IS_RSA_PKCS1V15_SIGN(alg) ||   \
      PSA_ALG_IS_DSA(alg) || PSA_ALG_IS_ECDSA(alg) ?                    \
+     ((alg) & PSA_ALG_HASH_MASK) == 0 ? /*"raw" algorithm*/ 0 :        \
      ((alg) & PSA_ALG_HASH_MASK) | PSA_ALG_CATEGORY_HASH :             \
      0)