diff --git a/main.c b/main.c
index fc58666..8eb3a11 100644
--- a/main.c
+++ b/main.c
@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <stdbool.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -70,7 +71,7 @@ int assign_workers(int* socket_fd) {
             memcpy(&port, buffer+1, sizeof(u_int32_t));
             port = ntohl(port);
             printf("[Host] Unassigning port %i\n", port);
-            ports[11000-port] = false;
+            ports[abs(11000-port)] = false;
             shutdown(client_sock, SHUT_RDWR);
             close(client_sock);
         }