diff --git a/src/modules/tls/tls_domain.c b/src/modules/tls/tls_domain.c
index a8859c4a318..fc84033e68d 100644
--- a/src/modules/tls/tls_domain.c
+++ b/src/modules/tls/tls_domain.c
@@ -27,6 +27,8 @@
 #include <stdlib.h>
 #include <openssl/ssl.h>
 #include <openssl/opensslv.h>
+#include <openssl/bn.h>
+#include <openssl/dh.h>
 
 #ifndef OPENSSL_NO_ENGINE
 #include <openssl/engine.h>
@@ -61,7 +63,7 @@ static void setup_ecdh(SSL_CTX *ctx)
 {
    EC_KEY *ecdh;
 
-   if (SSLeay() < 0x1000005fL) {
+   if (OpenSSL_version_num() < 0x1000005fL) {
       return;
    }
 
diff --git a/src/modules/tls/tls_init.c b/src/modules/tls/tls_init.c
index b9288cbd9a6..351ed4187ed 100644
--- a/src/modules/tls/tls_init.c
+++ b/src/modules/tls/tls_init.c
@@ -627,14 +627,13 @@ int tls_h_mod_pre_init_f(void)
 		return 0;
 	}
 	LM_DBG("preparing tls env for modules initialization\n");
-#if OPENSSL_VERSION_NUMBER >= 0x010100000L && !defined(LIBRESSL_VERSION_NUMBER)
-	LM_DBG("preparing tls env for modules initialization (libssl >=1.1)\n");
-	OPENSSL_init_ssl(0, NULL);
-#else
+#if OPENSSL_VERSION_NUMBER < 0x010100000L || defined(LIBRESSL_VERSION_NUMBER)
 	LM_DBG("preparing tls env for modules initialization (libssl <=1.0)\n");
 	SSL_library_init();
-#endif
 	SSL_load_error_strings();
+#else
+	LM_DBG("preparing tls env for modules initialization (libssl >=1.1)\n");
+#endif
 	tls_mod_preinitialized=1;
 	return 0;
 }
@@ -668,7 +667,7 @@ int tls_h_mod_init_f(void)
 #if OPENSSL_VERSION_NUMBER < 0x00907000L
 	LM_WARN("You are using an old version of OpenSSL (< 0.9.7). Upgrade!\n");
 #endif
-	ssl_version=SSLeay();
+	ssl_version=OpenSSL_version_num();
 	/* check if version have the same major minor and fix level
 	 * (e.g. 0.9.8a & 0.9.8c are ok, but 0.9.8 and 0.9.9x are not)
 	 * - values is represented as 0xMMNNFFPPS: major minor fix patch status
@@ -680,7 +679,7 @@ int tls_h_mod_init_f(void)
 				" compiled \"%s\" (0x%08lx).\n"
 				" Please make sure a compatible version is used"
 				" (tls_force_run in kamailio.cfg will override this check)\n",
-				SSLeay_version(SSLEAY_VERSION), ssl_version,
+				OpenSSL_version(OPENSSL_VERSION), ssl_version,
 				OPENSSL_VERSION_TEXT, (long)OPENSSL_VERSION_NUMBER);
 		if (cfg_get(tls, tls_cfg, force_run))
 			LM_WARN("tls_force_run turned on, ignoring "
@@ -857,6 +856,7 @@ int tls_check_sockets(tls_domains_cfg_t* cfg)
 void tls_h_mod_destroy_f(void)
 {
 	LM_DBG("tls module final tls destroy\n");
+#if OPENSSL_VERSION_NUMBER < 0x010100000L || defined(LIBRESSL_VERSION_NUMBER)
 	if(tls_mod_preinitialized > 0)
 		ERR_free_strings();
 	/* TODO: free all the ctx'es */
@@ -869,4 +869,5 @@ void tls_h_mod_destroy_f(void)
 	LM_DBG("executing openssl v1.1+ cleanup\n");
 	OPENSSL_cleanup();
 #endif
+#endif
 }
diff --git a/src/modules/tls/tls_locking.c b/src/modules/tls/tls_locking.c
index 4e5bbcc5e30..3eb6f033a5e 100644
--- a/src/modules/tls/tls_locking.c
+++ b/src/modules/tls/tls_locking.c
@@ -140,6 +140,8 @@ unsigned long sr_ssl_id_f()
 /* returns -1 on error, 0 on success */
 int tls_init_locks()
 {
+/* OpenSSL is thread-safe since 1.1.0 */
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 	/* init "static" tls locks */
 	n_static_locks=CRYPTO_num_locks();
 	if (n_static_locks<0){
@@ -167,13 +169,10 @@ int tls_init_locks()
 		CRYPTO_set_locking_callback(locking_f);
 	}
 
-/* OpenSSL is thread-safe since 1.1.0 */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
 	/* set "dynamic" locks callbacks */
 	CRYPTO_set_dynlock_create_callback(dyn_create_f);
 	CRYPTO_set_dynlock_lock_callback(dyn_lock_f);
 	CRYPTO_set_dynlock_destroy_callback(dyn_destroy_f);
-#endif
 
 	/* starting with v1.0.0 openssl does not use anymore getpid(), but address
 	 * of errno which can point to same virtual address in a multi-process
@@ -186,6 +185,7 @@ int tls_init_locks()
 	 *  (only atomic_inc), fallback to the default use-locks mode
 	 * CRYPTO_set_add_lock_callback(atomic_add_f);
 	 */
+#endif
 
 	return 0;
 error: