diff --git a/tests/art_unit.cpp b/tests/art_unit.cpp
index 06c71a08c..7b05d350c 100644
--- a/tests/art_unit.cpp
+++ b/tests/art_unit.cpp
@@ -186,7 +186,7 @@ DEFINE_TEST(test_art_erase_all) {
 }
 
 DEFINE_TEST(test_art_many_entries) {
-    const size_t kValues = 10000;
+    const size_t kValues = 100;
     std::vector<std::array<char, 6>> keys;
     std::vector<Value> values;
     keys.reserve(kValues);
diff --git a/tests/roaring64_unit.cpp b/tests/roaring64_unit.cpp
index ce4bdac20..d48b2127b 100644
--- a/tests/roaring64_unit.cpp
+++ b/tests/roaring64_unit.cpp
@@ -93,7 +93,7 @@ DEFINE_TEST(test_of_ptr) {
 }
 
 DEFINE_TEST(test_of) {
-    roaring64_bitmap_t* r = roaring64_bitmap_of(3, 1, 20000, 500000);
+    roaring64_bitmap_t* r = roaring64_bitmap_of(3, 1ULL, 20000ULL, 500000ULL);
     assert_true(roaring64_bitmap_contains(r, 1));
     assert_true(roaring64_bitmap_contains(r, 20000));
     assert_true(roaring64_bitmap_contains(r, 500000));