diff --git a/library/x509_crt.c b/library/x509_crt.c
index 6500445..f12ac6b 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -114,7 +114,7 @@
     MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
     MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
     MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
-    MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ),
+    0,
 #else
     0,
 #endif