diff --git a/include/etl/memory.h b/include/etl/memory.h
index 474cd449..2fc9341b 100644
--- a/include/etl/memory.h
+++ b/include/etl/memory.h
@@ -1260,6 +1260,24 @@ namespace etl
     }
 #endif
 
+    //*********************************
+    unique_ptr(pointer p_, typename etl::conditional<etl::is_reference<TDeleter>::value, 
+                                                     TDeleter, 
+                                                     typename etl::add_lvalue_reference<const TDeleter>::type>::type deleter_) ETL_NOEXCEPT
+      : p(p_)
+      , deleter(deleter_)
+    {
+    }
+
+#if ETL_CPP11_SUPPORTED
+    //*********************************
+    unique_ptr(pointer pValue, typename etl::remove_reference<TDeleter>::type&& deleter) ETL_NOEXCEPT
+      : p(p_)
+      , deleter(etl::move(deleter_))
+    {
+    }
+#endif
+
     //*********************************
     ~unique_ptr()
     {
diff --git a/include/etl/version.h b/include/etl/version.h
index b65e206b..c62cb2ad 100644
--- a/include/etl/version.h
+++ b/include/etl/version.h
@@ -39,7 +39,7 @@ SOFTWARE.
 
 #define ETL_VERSION_MAJOR 19
 #define ETL_VERSION_MINOR  4
-#define ETL_VERSION_PATCH  0
+#define ETL_VERSION_PATCH  1
 #define ETL_VERSION       ETL_STRINGIFY(ETL_VERSION_MAJOR) "." ETL_STRINGIFY(ETL_VERSION_MINOR) "." ETL_STRINGIFY(ETL_VERSION_PATCH)
 #define ETL_VERSION_W     ETL_STRINGIFY(ETL_VERSION_MAJOR) L"." ETL_STRINGIFY(ETL_VERSION_MINOR) L"." ETL_STRINGIFY(ETL_VERSION_PATCH)
 #define ETL_VERSION_U16   ETL_STRINGIFY(ETL_VERSION_MAJOR) u"." ETL_STRINGIFY(ETL_VERSION_MINOR) u"." ETL_STRINGIFY(ETL_VERSION_PATCH)
diff --git a/library.json b/library.json
index 7a7b3caa..753f742f 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "ETL Embedded Template Library",
-  "version": "19.4.0",
+  "version": "19.4.1",
   "author s": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/library.properties b/library.properties
index 3f950241..6d1dad9a 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library ETL
-version=19.4.0
+version=19.4.1
 author= John Wellbelove <john.wellbelove@etlcpp.com>
 maintainer=John Wellbelove <john.wellbelove@etlcpp.com>
 license=MIT
diff --git a/support/Release notes.txt b/support/Release notes.txt
index 4e6b9b80..19546d57 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -1,3 +1,7 @@
+===============================================================================
+19.4.1
+Added constructors with deleters for unique_ptr.
+
 ===============================================================================
 19.4.0
 Added virtual function 'void on_task_added()' that is called when a task is added to a scheduler.
diff --git a/test/test_memory.cpp b/test/test_memory.cpp
index 73962a9e..95645c03 100644
--- a/test/test_memory.cpp
+++ b/test/test_memory.cpp
@@ -1041,6 +1041,46 @@ namespace
       CHECK_EQUAL(7, up1[3]);
     }
 
+    //*************************************************************************
+    TEST(test_unique_ptr_custom_deleter)
+    {
+      //*******************************
+      struct Object
+      {
+        Object()
+          : count(1)
+        {
+        }
+
+        void Delete()
+        {
+          count = 0;
+        }
+
+        int count;
+      };
+
+      //*******************************
+      struct Deleter 
+      {
+        void operator()(Object* p) 
+        { 
+          p->Delete(); 
+        }
+      };
+
+      Deleter deleter;
+      Object object;
+
+      CHECK_EQUAL(1, object.count);
+
+      {
+        etl::unique_ptr<Object, Deleter> up(&object, deleter);
+      }
+
+      CHECK_EQUAL(0, object.count);
+    }
+
     //*************************************************************************
     TEST(test_uninitialized_buffer)
     {