diff --git a/main.c b/main.c
index 3fc496a..4a887c0 100644
--- a/main.c
+++ b/main.c
@@ -116,7 +116,7 @@ void *prime_thread_worker(void *arg) {
     prime_test_t *result_ptr = (prime_test_t *)arg;
 
     do {
-        result_ptr->prime = rand64();
+        result_ptr->prime = rand32();
         // printf("\nGenerating a new prime number (%p). Candidate: ", result_ptr);
         // printf("%ju", result_ptr->prime);
         // printf("\n");