diff --git a/src/System.Collections/src/System/Collections/Generic/HashSet.cs b/src/System.Collections/src/System/Collections/Generic/HashSet.cs
index e966a6c8b2cd..3466ac7ec34b 100644
--- a/src/System.Collections/src/System/Collections/Generic/HashSet.cs
+++ b/src/System.Collections/src/System/Collections/Generic/HashSet.cs
@@ -75,22 +75,16 @@ public class HashSet<T> : ICollection<T>, ISet<T>, IReadOnlyCollection<T>
         #region Constructors
 
         public HashSet()
-            : this(EqualityComparer<T>.Default)
+            : this(0, EqualityComparer<T>.Default)
         { }
 
         public HashSet(IEqualityComparer<T> comparer)
-        {
-            if (comparer == null)
-            {
-                comparer = EqualityComparer<T>.Default;
-            }
+            : this(0, comparer)
+        { }
 
-            _comparer = comparer;
-            _lastIndex = 0;
-            _count = 0;
-            _freeList = -1;
-            _version = 0;
-        }
+        public HashSet(int capacity)
+            : this(capacity, EqualityComparer<T>.Default)
+        { }
 
         public HashSet(IEnumerable<T> collection)
             : this(collection, EqualityComparer<T>.Default)
@@ -131,6 +125,30 @@ public HashSet(IEnumerable<T> collection, IEqualityComparer<T> comparer)
             }
         }
 
+        public HashSet(int capacity, IEqualityComparer<T> comparer)
+        {
+            if (capacity < 0)
+            {
+                throw new ArgumentOutOfRangeException("capacity");
+            }
+
+            if (comparer == null)
+            {
+                comparer = EqualityComparer<T>.Default;
+            }
+
+            _comparer = comparer;
+            _lastIndex = 0;
+            _count = 0;
+            _freeList = -1;
+            _version = 0;
+
+            if (capacity > 0)
+            {
+                Initialize(capacity);
+            }
+        }
+
         #endregion
 
         #region ICollection<T> methods