diff --git a/tests/viratomictest.c b/tests/viratomictest.c
index 4250329917f0ddc2c6ad95ff8d9751426ecf4e63..4b367026d00f4a07858db5ad22e7d475b756f33e 100644
--- a/tests/viratomictest.c
+++ b/tests/viratomictest.c
@@ -114,7 +114,7 @@ volatile int atomic;
 static void
 thread_func(void *data)
 {
-    int idx = (int)(long)data;
+    int idx = (intptr_t)data;
     int i;
     int d;
 
@@ -142,7 +142,7 @@ testThreads(const void *data ATTRIBUTE_UNUSED)
         bucket[i] = 0;
 
     for (i = 0; i < THREADS; i++) {
-        if (virThreadCreate(&(threads[i]), true, thread_func, (void*)(long)i) < 0)
+        if (virThreadCreate(&(threads[i]), true, thread_func, (void*)(intptr_t)i) < 0)
             return -1;
     }