diff --git a/lab01/zad1/src/main.c b/lab01/zad1/src/main.c
index feb784e..8bea2c3 100644
--- a/lab01/zad1/src/main.c
+++ b/lab01/zad1/src/main.c
@@ -2,14 +2,15 @@
 #include <stack.h>
 
 #include <time.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 
 void test_queue(size_t size) {
-    Queue *q = queue_new(size, sizeof(long));
+    Queue *q = queue_new(size, sizeof(int64_t));
 
     for (size_t i = 0; i < 50; ++i) {
-        long val = rand() % 1000;
+        int64_t val = rand() % 1000;
         printf("%zu: writing %ld to queue...\n", i, val);
         if (queue_write(q, &val)) {
             printf("%zu: successfully wrote %ld to queue!\n", i, val);
@@ -25,7 +26,7 @@ void test_queue(size_t size) {
             break;
         }
 
-        long val = *(long*)val_ptr;
+        int64_t val = *(int64_t*)val_ptr;
         printf("%zu: read %ld from queue\n", i, val);
         free(val_ptr);
     }
@@ -34,10 +35,10 @@ void test_queue(size_t size) {
 }
 
 void test_stack(size_t size) {
-    Stack *s = stack_new(size, sizeof(long));
+    Stack *s = stack_new(size, sizeof(int64_t));
 
     for (size_t i = 0; i < 50; ++i) {
-        long val = rand() % 1000;
+        int64_t val = rand() % 1000;
         printf("%zu: pushing %ld on top of stack...\n", i, val);
         if (stack_push(s, &val)) {
             printf("%zu: successfully pushed %ld on top of stack!\n", i, val);
@@ -53,7 +54,7 @@ void test_stack(size_t size) {
             break;
         }
 
-        long val = *(long*)val_ptr;
+        int64_t val = *(int64_t*)val_ptr;
         printf("%zu: popped %ld from stack\n", i, val);
         free(val_ptr);
     }