diff --git a/src/fd_utils.c b/src/fd_utils.c
index a3e65c8..e268908 100644
--- a/src/fd_utils.c
+++ b/src/fd_utils.c
@@ -52,17 +52,17 @@ int uc_set_tcp_keepalive_cfg(int sockfd, const struct UCKeepConfig *cfg)
     }
 
     //set the keepalive options
-    rc = setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, &cfg->keepcnt, sizeof cfg->keepcnt);
+    rc = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPCNT, &cfg->keepcnt, sizeof cfg->keepcnt);
     if (rc != 0) {
         return rc;
     }
 
-    rc = setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, &cfg->keepidle, sizeof cfg->keepintvl);
+    rc = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPCNT, &cfg->keepidle, sizeof cfg->keepintvl);
     if (rc != 0) {
         return rc;
     }
 
-    rc = setsockopt(sockfd, SOL_TCP, TCP_KEEPCNT, &cfg->keepintvl, sizeof cfg->keepintvl);
+    rc = setsockopt(sockfd, IPPROTO_TCP, TCP_KEEPCNT, &cfg->keepintvl, sizeof cfg->keepintvl);
     if (rc != 0) {
         return rc;
     }