diff --git a/test/sync/sync.c b/test/sync/sync.c
index bd1b0addd..fcb2a4a52 100644
--- a/test/sync/sync.c
+++ b/test/sync/sync.c
@@ -124,19 +124,19 @@ test_set_counter(xcb_connection_t *c)
 static void
 test_change_counter_basic(xcb_connection_t *c)
 {
-    int iterations = 4;
-    xcb_sync_query_counter_cookie_t queries[iterations];
+#define T1_ITERATIONS 4
+    xcb_sync_query_counter_cookie_t queries[T1_ITERATIONS];
 
     xcb_sync_counter_t counter = xcb_generate_id(c);
     xcb_sync_create_counter(c, counter, sync_value(0));
 
-    for (int i = 0; i < iterations; i++) {
+    for (int i = 0; i < T1_ITERATIONS; i++) {
         xcb_sync_change_counter(c, counter, sync_value(i));
         queries[i] = xcb_sync_query_counter_unchecked(c, counter);
     }
 
     int64_t expected_value = 0;
-    for (int i = 0; i < iterations; i++) {
+    for (int i = 0; i < T1_ITERATIONS; i++) {
         expected_value += i;
         int64_t value = counter_value(c, queries[i]);
 
@@ -154,9 +154,9 @@ test_change_counter_basic(xcb_connection_t *c)
 static void
 test_change_counter_overflow(xcb_connection_t *c)
 {
-    int iterations = 4;
-    xcb_sync_query_counter_cookie_t queries[iterations];
-    xcb_void_cookie_t changes[iterations];
+#define T2_ITERATIONS 4
+    xcb_sync_query_counter_cookie_t queries[T2_ITERATIONS];
+    xcb_void_cookie_t changes[T2_ITERATIONS];
     static const struct {
         int64_t a, b;
     } overflow_args[] = {