diff --git a/src/first-free-port.c b/src/first-free-port.c
index a6a9df5..1789e85 100644
--- a/src/first-free-port.c
+++ b/src/first-free-port.c
@@ -94,7 +94,7 @@ int main(int argc, char *argv[]) {
     }
 
     unsigned short *listening_ports = malloc(PORTS_BLOCKS_TO_ALLOW * sizeof(unsigned short));
-    get_listening_ports(listening_ports, tcp_table_fptr);
+    listening_ports = get_listening_ports(listening_ports, tcp_table_fptr);
 
     // Check if the current port is available, add
     while (!is_port_available(current_port, listening_ports)) {