diff --git a/src/or/connection.c b/src/or/connection.c
index b4cd4cdddb..be59a2c048 100644
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@ -1139,7 +1139,8 @@ connection_listener_new(const struct sockaddr *listensockaddr,
     if (options->TransProxyType_parsed == TPT_TPROXY &&
         type == CONN_TYPE_AP_TRANS_LISTENER) {
       int one = 1;
-      if (setsockopt(s, SOL_IP, IP_TRANSPARENT, &one, sizeof(one)) < 0) {
+      if (setsockopt(s, SOL_IP, IP_TRANSPARENT, (void*)&one,
+                     (socklen_t)sizeof(one)) < 0) {
         const char *extra = "";
         int e = tor_socket_errno(s);
         if (e == EPERM)
@@ -1162,7 +1163,7 @@ connection_listener_new(const struct sockaddr *listensockaddr,
       /* We need to set IPV6_V6ONLY so that this socket can't get used for
        * IPv4 connections. */
       if (setsockopt(s,IPPROTO_IPV6, IPV6_V6ONLY,
-                     (void*)&one, sizeof(one)) < 0) {
+                     (void*)&one, (socklen_t)sizeof(one)) < 0) {
         int e = tor_socket_errno(s);
         log_warn(LD_NET, "Error setting IPV6_V6ONLY flag: %s",
                  tor_socket_strerror(e));
diff --git a/src/or/main.c b/src/or/main.c
index 455cba4513..5c65d46263 100644
--- a/src/or/main.c
+++ b/src/or/main.c
@@ -225,11 +225,13 @@ set_buffer_lengths_to_zero(tor_socket_t s)
 {
   int zero = 0;
   int r = 0;
-  if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (void*)&zero, sizeof(zero))) {
+  if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (void*)&zero,
+                 (socklen_t)sizeof(zero))) {
     log_warn(LD_NET, "Unable to clear SO_SNDBUF");
     r = -1;
   }
-  if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, (void*)&zero, sizeof(zero))) {
+  if (setsockopt(s, SOL_SOCKET, SO_RCVBUF, (void*)&zero,
+                 (socklen_t)sizeof(zero))) {
     log_warn(LD_NET, "Unable to clear SO_RCVBUF");
     r = -1;
   }
diff --git a/src/test/test_switch_id.c b/src/test/test_switch_id.c
index 9b093671e8..a47858ab07 100644
--- a/src/test/test_switch_id.c
+++ b/src/test/test_switch_id.c
@@ -47,7 +47,8 @@ check_can_bind_low_ports(void)
     }
 
     int one = 1;
-    if (setsockopt(fd, SOL_SOCKET,SO_REUSEADDR, &one, sizeof(one))) {
+    if (setsockopt(fd, SOL_SOCKET,SO_REUSEADDR, (void*)&one,
+                   (socklen_t)sizeof(one))) {
       perror("setsockopt");
       tor_close_socket_simple(fd);
       return -1;