diff --git a/src/borg/crypto/_crypto_helpers.c b/src/borg/crypto/_crypto_helpers.c
index 0a433bb5f..397d50679 100644
--- a/src/borg/crypto/_crypto_helpers.c
+++ b/src/borg/crypto/_crypto_helpers.c
@@ -4,7 +4,7 @@
 #include <openssl/opensslv.h>
 #include <openssl/hmac.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 
 HMAC_CTX *HMAC_CTX_new(void)
 {
diff --git a/src/borg/crypto/_crypto_helpers.h b/src/borg/crypto/_crypto_helpers.h
index bb9afc418..cf0b3efe0 100644
--- a/src/borg/crypto/_crypto_helpers.h
+++ b/src/borg/crypto/_crypto_helpers.h
@@ -4,7 +4,7 @@
 #include <openssl/hmac.h>
 #include <openssl/evp.h>
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 
 HMAC_CTX *HMAC_CTX_new(void);
 void HMAC_CTX_free(HMAC_CTX *ctx);