--- psutil/_psutil_linux.c
+++ psutil/_psutil_linux.c
@@ -517,7 +517,7 @@ psutil_net_if_stats(PyObject* self, PyObject* args)
     // duplex and speed
     memset(&ethcmd, 0, sizeof ethcmd);
     ethcmd.cmd = ETHTOOL_GSET;
-    ifr.ifr_data = (caddr_t)&ethcmd;
+    ifr.ifr_data = (void *)&ethcmd;
     ret = ioctl(sock, SIOCETHTOOL, &ifr);
 
     if (ret != -1) {
diff --git a/psutil/_psutil_posix.c b/psutil/_psutil_posix.c
index 183dab0e12ee..4ff410601e85 100644
--- psutil/_psutil_posix.c
+++ psutil/_psutil_posix.c
@@ -418,7 +418,7 @@ psutil_net_if_stats(PyObject *self, PyObject *args)
     // speed / duplex
     memset(&ifmed, 0, sizeof(struct ifmediareq));
     strlcpy(ifmed.ifm_name, nic_name, sizeof(ifmed.ifm_name));
-    ret = ioctl(sock, SIOCGIFMEDIA, (caddr_t)&ifmed);
+    ret = ioctl(sock, SIOCGIFMEDIA, (void *)&ifmed);
     if (ret == -1) {
         speed = 0;
         duplex = 0;