diff --git a/libratbox/src/openssl.c b/libratbox/src/openssl.c
index 850318b2d..4544ad6bd 100644
--- a/libratbox/src/openssl.c
+++ b/libratbox/src/openssl.c
@@ -33,6 +33,7 @@
 #include <openssl/ssl.h>
 #include <openssl/dh.h>
 #include <openssl/err.h>
+#include <openssl/evp.h>
 #include <openssl/rand.h>
 
 static SSL_CTX *ssl_server_ctx;
@@ -666,7 +667,8 @@ rb_get_ssl_certfp(rb_fde_t *F, uint8_t certfp[RB_SSL_CERTFP_LEN])
 				res == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE ||
 				res == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT)
 		{
-			memcpy(certfp, cert->sha1_hash, RB_SSL_CERTFP_LEN);
+			unsigned int certfp_length = RB_SSL_CERTFP_LEN;
+			X509_digest(cert, EVP_sha1(), certfp, &certfp_length);
 			X509_free(cert);
 			return 1;
 		}