diff --git a/helio b/helio
index 33673ea29..deb4c1ac2 160000
--- a/helio
+++ b/helio
@@ -1 +1 @@
-Subproject commit 33673ea2952529c4e8a9dca9903e38a3dbafef58
+Subproject commit deb4c1ac263c00d6602a3e1158ccae04a9b28417
diff --git a/src/core/segment_allocator.cc b/src/core/segment_allocator.cc
index abf6801ea..654af1847 100644
--- a/src/core/segment_allocator.cc
+++ b/src/core/segment_allocator.cc
@@ -7,15 +7,15 @@
 
 #include "base/logging.h"
 
-constexpr size_t kSegmentShift = MI_SEGMENT_SHIFT;
-
 namespace dfly {
 
 SegmentAllocator::SegmentAllocator(mi_heap_t* heap) : heap_(heap) {
-  // mimalloc uses 4MiB segments and we might need change this code if it changes.
-  constexpr size_t kSegLogSpan = 32 - kSegmentIdBits + 3;
-  static_assert(kSegLogSpan == kSegmentShift);
-  static_assert((~kSegmentAlignMask) == (MI_SEGMENT_SIZE - 1));
+  // 256GB
+  constexpr size_t limit = 1ULL << 35;
+  static_assert((1ULL << (kSegmentIdBits + kSegmentShift)) == limit);
+  // mimalloc uses 32MiB segments and we might need change this code if it changes.
+  static_assert(kSegmentShift == MI_SEGMENT_SHIFT);
+  static_assert((~kSegmentAlignMask) == (MI_SEGMENT_MASK));
 }
 
 void SegmentAllocator::ValidateMapSize() {
diff --git a/src/core/segment_allocator.h b/src/core/segment_allocator.h
index 5c98c7719..cc5e640a5 100644
--- a/src/core/segment_allocator.h
+++ b/src/core/segment_allocator.h
@@ -17,16 +17,19 @@ namespace dfly {
 
 /**
  * @brief Tightly coupled with mi_malloc 2.x implementation.
- *        Fetches 4MiB segment pointers from the allocated pointers.
+ *        Fetches 32MiB segment pointers from the allocated pointers.
  *        Provides own indexing of small pointers to real address space using the segment ptrs/
  */
 
 class SegmentAllocator {
-  static constexpr uint32_t kSegmentIdBits = 13;
+  // (2 ^ 10) total segments
+  static constexpr uint32_t kSegmentIdBits = 10;
   static constexpr uint32_t kSegmentIdMask = (1u << kSegmentIdBits) - 1;
+  // (2 ^ 25) total bytes per segment = 32MiB
+  static constexpr uint32_t kSegmentShift = 25;
 
   // Segment range that we cover within a single segment.
-  static constexpr uint64_t kSegmentAlignMask = ~((1ULL << (32 - kSegmentIdBits + 3)) - 1);
+  static constexpr uint64_t kSegmentAlignMask = ~((1ULL << kSegmentShift) - 1);
 
  public:
   using Ptr = uint32_t;