diff --git a/Userland/Libraries/LibC/serenity.cpp b/Userland/Libraries/LibC/serenity.cpp
index 1cf5f5f68f..f3a0517e94 100644
--- a/Userland/Libraries/LibC/serenity.cpp
+++ b/Userland/Libraries/LibC/serenity.cpp
@@ -24,6 +24,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <arpa/inet.h>
 #include <errno.h>
 #include <serenity.h>
 #include <string.h>
@@ -149,4 +150,19 @@ int getkeymap(char* name_buffer, size_t name_buffer_size, u32* map, u32* shift_m
     int rc = syscall(SC_getkeymap, &params);
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
+
+u16 internet_checksum(const void* ptr, size_t count)
+{
+    u32 checksum = 0;
+    auto* w = (const u16*)ptr;
+    while (count > 1) {
+        checksum += ntohs(*w++);
+        if (checksum & 0x80000000)
+            checksum = (checksum & 0xffff) | (checksum >> 16);
+        count -= 2;
+    }
+    while (checksum >> 16)
+        checksum = (checksum & 0xffff) + (checksum >> 16);
+    return htons(~checksum);
+}
 }
diff --git a/Userland/Libraries/LibC/serenity.h b/Userland/Libraries/LibC/serenity.h
index ecadd164e3..8a7f632a0b 100644
--- a/Userland/Libraries/LibC/serenity.h
+++ b/Userland/Libraries/LibC/serenity.h
@@ -109,4 +109,6 @@ int serenity_readlink(const char* path, size_t path_length, char* buffer, size_t
 int getkeymap(char* name_buffer, size_t name_buffer_size, uint32_t* map, uint32_t* shift_map, uint32_t* alt_map, uint32_t* altgr_map, uint32_t* shift_altgr_map);
 int setkeymap(const char* name, const uint32_t* map, uint32_t* const shift_map, const uint32_t* alt_map, const uint32_t* altgr_map, const uint32_t* shift_altgr_map);
 
+uint16_t internet_checksum(const void* ptr, size_t count);
+
 __END_DECLS
diff --git a/Userland/Utilities/ping.cpp b/Userland/Utilities/ping.cpp
index 977b97c929..c0253ba2ec 100644
--- a/Userland/Utilities/ping.cpp
+++ b/Userland/Utilities/ping.cpp
@@ -29,6 +29,7 @@
 #include <netdb.h>
 #include <netinet/in.h>
 #include <netinet/ip_icmp.h>
+#include <serenity.h>
 #include <signal.h>
 #include <stdio.h>
 #include <string.h>
@@ -37,21 +38,6 @@
 #include <time.h>
 #include <unistd.h>
 
-static uint16_t internet_checksum(const void* ptr, size_t count)
-{
-    uint32_t checksum = 0;
-    auto* w = (const uint16_t*)ptr;
-    while (count > 1) {
-        checksum += ntohs(*w++);
-        if (checksum & 0x80000000)
-            checksum = (checksum & 0xffff) | (checksum >> 16);
-        count -= 2;
-    }
-    while (checksum >> 16)
-        checksum = (checksum & 0xffff) + (checksum >> 16);
-    return htons(~checksum);
-}
-
 static int total_pings;
 static int successful_pings;
 static uint32_t total_ms;