diff --git a/scripts/mbedtls_dev/crypto_knowledge.py b/scripts/mbedtls_dev/crypto_knowledge.py
index 3230a005d..45d253b9b 100644
--- a/scripts/mbedtls_dev/crypto_knowledge.py
+++ b/scripts/mbedtls_dev/crypto_knowledge.py
@@ -267,6 +267,8 @@ class KeyType:
             if alg.head in {'PURE_EDDSA', 'EDDSA_PREHASH'} and \
                eccc == EllipticCurveCategory.TWISTED_EDWARDS:
                 return True
+        if self.head == 'DH' and alg.head == 'FFDH':
+            return True
         return False