diff --git a/scripts/ecc-heap.sh b/scripts/ecc-heap.sh
index bf873f7..94a04cf 100755
--- a/scripts/ecc-heap.sh
+++ b/scripts/ecc-heap.sh
@@ -49,7 +49,7 @@
 #define MBEDTLS_ECP_DP_SECP256R1_ENABLED
 #define MBEDTLS_ECP_DP_SECP384R1_ENABLED
 #define MBEDTLS_ECP_DP_SECP521R1_ENABLED
-#define MBEDTLS_ECP_DP_M255_ENABLED
+#define MBEDTLS_ECP_DP_CURVE25519_ENABLED
 
 #include "check_config.h"