diff --git a/lab01/zad1/src/main.c b/lab01/zad1/src/main.c
index 8bea2c3..a139339 100644
--- a/lab01/zad1/src/main.c
+++ b/lab01/zad1/src/main.c
@@ -20,15 +20,14 @@ void test_queue(size_t size) {
     }
 
     for (size_t i = 0; i < 50; ++i) {
-        void *val_ptr = queue_read(q);
-        if (val_ptr == NULL) {
+        int64_t *val = (int64_t*)queue_read(q);
+        if (val == NULL) {
             printf("%zu: queue is empty!\n", i);
             break;
         }
 
-        int64_t val = *(int64_t*)val_ptr;
-        printf("%zu: read %ld from queue\n", i, val);
-        free(val_ptr);
+        printf("%zu: read %ld from queue\n", i, *val);
+        free(val);
     }
 
     queue_free(q);
@@ -48,15 +47,14 @@ void test_stack(size_t size) {
     }
 
     for (size_t i = 0; i < 50; ++i) {
-        void *val_ptr = stack_pop(s);
-        if (val_ptr == NULL) {
+        int64_t *val = (int64_t*)stack_pop(s);
+        if (val == NULL) {
             printf("%zu: stack is empty!\n", i);
             break;
         }
 
-        int64_t val = *(int64_t*)val_ptr;
-        printf("%zu: popped %ld from stack\n", i, val);
-        free(val_ptr);
+        printf("%zu: popped %ld from stack\n", i, *val);
+        free(val);
     }
 
     stack_free(s);