diff --git a/Kernel/API/POSIX/net/if.h b/Kernel/API/POSIX/net/if.h
index 9c63d9ff826..3a90a8ec33c 100644
--- a/Kernel/API/POSIX/net/if.h
+++ b/Kernel/API/POSIX/net/if.h
@@ -79,6 +79,11 @@ struct ifreq {
 #define ifr_hwaddr ifr_ifru.ifru_hwaddr       // MAC address
 };
 
+struct if_nameindex {
+    unsigned int if_index;
+    char* if_name;
+};
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/Userland/Libraries/LibC/net.cpp b/Userland/Libraries/LibC/net.cpp
index ff79a90171a..145ef4b1536 100644
--- a/Userland/Libraries/LibC/net.cpp
+++ b/Userland/Libraries/LibC/net.cpp
@@ -21,3 +21,15 @@ char* if_indextoname([[maybe_unused]] unsigned int ifindex, [[maybe_unused]] cha
     errno = ENXIO;
     return nullptr;
 }
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/functions/if_nameindex.html
+struct if_nameindex* if_nameindex()
+{
+    errno = ENOSYS;
+    return nullptr;
+}
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/functions/if_freenameindex.html
+void if_freenameindex(struct if_nameindex*)
+{
+}
diff --git a/Userland/Libraries/LibC/net/if.h b/Userland/Libraries/LibC/net/if.h
index ff32ea69fe7..dd6a4ca97a9 100644
--- a/Userland/Libraries/LibC/net/if.h
+++ b/Userland/Libraries/LibC/net/if.h
@@ -12,5 +12,7 @@ __BEGIN_DECLS
 
 unsigned int if_nametoindex(char const* ifname);
 char* if_indextoname(unsigned int ifindex, char* ifname);
+struct if_nameindex* if_nameindex();
+void if_freenameindex(struct if_nameindex* ptr);
 
 __END_DECLS