diff --git a/include/psa/crypto_values.h b/include/psa/crypto_values.h
index 5a903f8..3e7afef 100644
--- a/include/psa/crypto_values.h
+++ b/include/psa/crypto_values.h
@@ -553,6 +553,9 @@
                         ((type) & PSA_KEY_TYPE_ECC_CURVE_MASK) : \
                         0))
 
+/** Check if the curve of given family is Weierstrass elliptic curve. */
+#define PSA_ECC_FAMILY_IS_WEIERSTRASS(family) ((family & 0xc0) == 0)
+
 /** SEC Koblitz curves over prime fields.
  *
  * This family comprises the following curves: