diff --git a/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift b/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift
index 0aefeb848..44854293e 100644
--- a/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift
+++ b/Sources/HashTreeCollections/HashNode/_HashNode+Storage.swift
@@ -77,10 +77,15 @@ extension _HashNode.Storage {
       bytes += itemAlignment - childAlignment
     }
 
+    let mincap = (bytes &+ childStride &- 1) / childStride
     let object = _HashNode.Storage.create(
-      minimumCapacity: (bytes &+ childStride &- 1) / childStride
+      minimumCapacity: mincap
     ) { buffer in
+#if os(OpenBSD)
+      _HashNodeHeader(byteCapacity: mincap * childStride)
+#else
       _HashNodeHeader(byteCapacity: buffer.capacity * childStride)
+#endif
     }
 
     object.withUnsafeMutablePointers { header, elements in
diff --git a/Sources/HashTreeCollections/HashNode/_HashTreeStatistics.swift b/Sources/HashTreeCollections/HashNode/_HashTreeStatistics.swift
index 85468af5f..0dd1efedc 100644
--- a/Sources/HashTreeCollections/HashNode/_HashTreeStatistics.swift
+++ b/Sources/HashTreeCollections/HashNode/_HashTreeStatistics.swift
@@ -118,8 +118,7 @@ extension _HashNode {
       // Note: for simplicity, we assume that there is no padding between
       // the object header and the storage header.
       let start = _getUnsafePointerToStoredProperties(self.raw.storage)
-      let capacity = self.raw.storage.capacity
-      let end = $0._memory + capacity * MemoryLayout<_RawHashNode>.stride
+      let end = $0._memory + $0.byteCapacity
       stats.grossBytes += objectHeaderSize + (end - start)
 
       for child in $0.children {