diff --git a/src/context.c b/src/context.c
index 5f5a1f5..d483359 100644
--- a/src/context.c
+++ b/src/context.c
@@ -709,9 +709,10 @@ static int set_alpn_cb(lua_State *L)
  */
 static int set_dane(lua_State *L)
 {
+  int ret;
   SSL_CTX *ctx = lsec_checkcontext(L, 1);
-  int ret = SSL_CTX_dane_enable(ctx);
-  lua_pushboolean(L, ret);
+  ret = SSL_CTX_dane_enable(ctx);
+  lua_pushboolean(L, (ret > 0));
   return 1;
 }
 #endif
diff --git a/src/ssl.c b/src/ssl.c
index 0117674..a8c42c8 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -829,24 +829,26 @@ static int meth_copyright(lua_State *L)
 #if (OPENSSL_VERSION_NUMBER >= 0x1010000fL)
 static int meth_dane(lua_State *L)
 {
+  int ret;
   p_ssl ssl = (p_ssl)luaL_checkudata(L, 1, "SSL:Connection");
-  int ret = SSL_dane_enable(ssl->ssl, luaL_checkstring(L, 2));
-  lua_pushboolean(L, ret);
+  ret = SSL_dane_enable(ssl->ssl, luaL_checkstring(L, 2));
+  lua_pushboolean(L, (ret > 0));
   return 1;
 }
 
 static int meth_tlsa(lua_State *L)
 {
+  int ret;
+  size_t len;
   p_ssl ssl = (p_ssl)luaL_checkudata(L, 1, "SSL:Connection");
   uint8_t usage = luaL_checkinteger(L, 2);
   uint8_t selector = luaL_checkinteger(L, 3);
   uint8_t mtype = luaL_checkinteger(L, 4);
-  size_t len;
-  const char *data = luaL_checklstring(L, 5, &len);
+  unsigned char *data = (unsigned char*)luaL_checklstring(L, 5, &len);
 
   ERR_clear_error();
-  int ret = SSL_dane_tlsa_add(ssl->ssl, usage, selector, mtype, data, len);
-  lua_pushboolean(L, ret);
+  ret = SSL_dane_tlsa_add(ssl->ssl, usage, selector, mtype, data, len);
+  lua_pushboolean(L, (ret > 0));
 
   return 1;
 }