diff --git a/include/base.h b/include/base.h
index 040fa98..9e9947e 100644
--- a/include/base.h
+++ b/include/base.h
@@ -85,7 +85,7 @@ struct {
     int nMaxThread;
     int nMaxCycles;
     int ruleRadius;
-    pthread_t *id;
+    pthread_t id;
     bool pleaseStop;
 } typedef Scheduler_t;
 
@@ -104,7 +104,7 @@ struct Center_t {
 } typedef Center_t;
 
 struct {
-    pthread_t *id;
+    pthread_t id;
     Center_t *localWorkAreaCenter;
     Space_t *globalDrawingSpace;
     IntArray_t *conditionTree;
@@ -120,7 +120,7 @@ struct {
 // Server
 //
 struct {
-    pthread_t *id;
+    pthread_t id;
     bool pleaseStop;
 } typedef Server_t;
 
@@ -136,7 +136,7 @@ struct {
 // Supervisor
 //
 struct {
-    pthread_t *id;
+    pthread_t id;
     bool pleaseStop;
     int *workerCreationOccurency;
 } typedef Supervisor_t;
diff --git a/include/localworker.h b/include/localworker.h
index 7e2b6eb..f609054 100644
--- a/include/localworker.h
+++ b/include/localworker.h
@@ -37,8 +37,7 @@ static inline void WorkerDestroy(Worker_t *worker)
     worker->terminated = false;
     worker->returnValue = false;
 
-    free(worker->id);
-    worker->id = NULL;
+    worker->id = 0;
     free(worker->localWorkAreaCenter);
     worker->localWorkAreaCenter = NULL;
 }
@@ -48,5 +47,5 @@ static inline void WorkerDestroy(Worker_t *worker)
 // -------------------------------------------------------------------------- //
 static inline void WorkerWait(Worker_t *worker)
 {
-    pthread_join(*worker->id, NULL);
+    pthread_join(worker->id, NULL);
 }
diff --git a/include/scheduler.h b/include/scheduler.h
index cb5eb40..0149738 100644
--- a/include/scheduler.h
+++ b/include/scheduler.h
@@ -33,7 +33,6 @@ void SchedInit(Scheduler_t *scheduler);
 // -------------------------------------------------------------------------- //
 static inline void SchedDestroy(Scheduler_t *scheduler)
 {
-    free(scheduler->id);
     free(scheduler->globalDrawingSpace->space);
     free(scheduler->globalDrawingSpace);
 
@@ -46,5 +45,5 @@ static inline void SchedDestroy(Scheduler_t *scheduler)
 // -------------------------------------------------------------------------- //
 static inline void SchedWait(Scheduler_t *scheduler)
 {
-    pthread_join(*scheduler->id, NULL);
+    pthread_join(scheduler->id, NULL);
 }
diff --git a/include/server.h b/include/server.h
index ce08e27..6dbf3e3 100644
--- a/include/server.h
+++ b/include/server.h
@@ -33,7 +33,6 @@ void ServerInit(Server_t *server);
 // -------------------------------------------------------------------------- //
 static inline void ServerDestroy(Server_t *server)
 {
-    free(server->id);
 }
 
 // -------------------------------------------------------------------------- //
@@ -41,5 +40,5 @@ static inline void ServerDestroy(Server_t *server)
 // -------------------------------------------------------------------------- //
 static inline void ServerWait(Server_t *server)
 {
-    pthread_join(*server->id, NULL);
+    pthread_join(server->id, NULL);
 }
diff --git a/include/supervisor.h b/include/supervisor.h
index d7b4e67..baa4d97 100644
--- a/include/supervisor.h
+++ b/include/supervisor.h
@@ -33,7 +33,6 @@ void SupervisorInit(Supervisor_t *supervisor);
 // -------------------------------------------------------------------------- //
 static inline void SupervisorDestroy(Supervisor_t *supervisor)
 {
-    free(supervisor->id);
 }
 
 // -------------------------------------------------------------------------- //
@@ -41,5 +40,5 @@ static inline void SupervisorDestroy(Supervisor_t *supervisor)
 // -------------------------------------------------------------------------- //
 static inline void SupervisorWait(Supervisor_t *supervisor)
 {
-    pthread_join(*supervisor->id, NULL);
+    pthread_join(supervisor->id, NULL);
 }
diff --git a/src/localworker.c b/src/localworker.c
index 14fb910..1931a2d 100644
--- a/src/localworker.c
+++ b/src/localworker.c
@@ -30,9 +30,8 @@ static void *workerMain(void *worker);
 // -------------------------------------------------------------------------- //
 void WorkerInit(Worker_t *worker)
 {
-    worker->id = (pthread_t*) calloc(1, sizeof(pthread_t));
-    if (pthread_create(worker->id, NULL, workerMain, worker)) {
-        printLog("Worker #%lu can't be initialized!\n", *(worker->id));
+    if (pthread_create(&worker->id, NULL, workerMain, worker)) {
+        printLog("Worker #%lu can't be initialized!\n", worker->id);
         return;
     }
 }
@@ -46,7 +45,7 @@ static void *workerMain(void *worker)
     int a = rand()%__INT_MAX__;
 
     args = (Worker_t*) worker;
-    printLog("Worker #%lu online\n", *args->id);
+    printLog("Worker #%lu online\n", args->id);
 
     int size = args->globalDrawingSpace->size;
     /* In each cell: the West (left) site is 0, the East (right) site is 1 */
@@ -85,7 +84,7 @@ static void *workerMain(void *worker)
     args->returnValue = a;
     args->terminated = true;
 
-    printLog("Worker #%lu offline\n", *args->id);
+    printLog("Worker #%lu offline\n", args->id);
 
     return NULL;
 }
diff --git a/src/scheduler.c b/src/scheduler.c
index cb6096d..f5254d8 100644
--- a/src/scheduler.c
+++ b/src/scheduler.c
@@ -35,8 +35,7 @@ static void *schedulerMain(void *scheduler);
 // -------------------------------------------------------------------------- //
 void SchedInit(Scheduler_t *scheduler)
 {
-    scheduler->id = (pthread_t*) calloc(1, sizeof(pthread_t));
-    pthread_create(scheduler->id, NULL, schedulerMain, scheduler);
+    pthread_create(&scheduler->id, NULL, schedulerMain, scheduler);
 }
 
 /* -------------------------------------------------------------------------- */
@@ -88,7 +87,7 @@ static void *schedulerMain(void *scheduler)
 
     // Getting scheduler argument structure
     args = (Scheduler_t*) scheduler;
-    printLog("Scheduler #%lu online\n", *args->id);
+    printLog("Scheduler #%lu online\n", args->id);
 
     if (!args->nMaxThread) {                // nmaxthread = 0 => no minimum
         ncpu = get_nprocs();                // allocating all the cpus available
@@ -181,7 +180,7 @@ static void *schedulerMain(void *scheduler)
                     // Remove preemption on space
                     CenterRemove(workerArray[i].localWorkAreaCenter);
                     printLog("Worker #%lu terminated with return %d. Cleaning...\n",
-                             *workerArray[i].id,
+                             workerArray[i].id,
                              workerArray[i].returnValue
                              );
                     // Remove Worker
@@ -197,13 +196,13 @@ static void *schedulerMain(void *scheduler)
     // Waiting for remaining workers
     for (int i = 0; i < ncpu; i++) {
         if (workerArray[i].id) {
-            printLog("Waiting for termination of worker #%lu\n", *workerArray[i].id);
+            printLog("Waiting for termination of worker #%lu\n", workerArray[i].id);
             // Join the thread to wait for his termination
             WorkerWait(&workerArray[i]);
             // Remove preemption on space
             CenterRemove(workerArray[i].localWorkAreaCenter);
             printLog("Worker #%lu terminated with return %d. Cleaning...\n",
-                     *workerArray[i].id,
+                     workerArray[i].id,
                      workerArray[i].returnValue
                      );
             // Remove Worker
@@ -211,7 +210,7 @@ static void *schedulerMain(void *scheduler)
         }
     }
 
-    printLog("Scheduler #%lu offline\n", *args->id);
+    printLog("Scheduler #%lu offline\n", args->id);
 
     free(workerArray);
     free(centersList);
diff --git a/src/server.c b/src/server.c
index 58fc334..8830455 100644
--- a/src/server.c
+++ b/src/server.c
@@ -35,8 +35,7 @@ static void *serverMain(void *server);
 // -------------------------------------------------------------------------- //
 void ServerInit(Server_t *server)
 {
-    server->id = (pthread_t*) calloc(1, sizeof(pthread_t));
-    pthread_create(server->id, NULL, serverMain, server);
+    pthread_create(&server->id, NULL, serverMain, server);
 }
 
 #define SEND_BUFFER_SIZE 80 * 24
@@ -107,7 +106,7 @@ static void *serverMain(void *server)
 
      // Get args
     args = (Server_t*) server;
-    printLog("Server #%lu online\n", *args->id);
+    printLog("Server #%lu online\n", args->id);
 
     // Create socket
     sockfd = socket(AF_INET, SOCK_STREAM, 0);
@@ -157,6 +156,6 @@ serverExiting:
     close(sockfd);
 
 serverEarlyExiting:
-    printLog("Server #%lu offline\n", *args->id);
+    printLog("Server #%lu offline\n", args->id);
     return NULL;
 }
diff --git a/src/supervisor.c b/src/supervisor.c
index d173719..a3e8805 100644
--- a/src/supervisor.c
+++ b/src/supervisor.c
@@ -30,8 +30,7 @@ static void *supervisorMain(void *supervisor);
 // -------------------------------------------------------------------------- //
 void SupervisorInit(Supervisor_t *supervisor)
 {
-    supervisor->id = (pthread_t*) calloc(1, sizeof(pthread_t));
-    pthread_create(supervisor->id, NULL, supervisorMain, supervisor);
+    pthread_create(&supervisor->id, NULL, supervisorMain, supervisor);
 }
 
 // -------------------------------------------------------------------------- //