diff --git a/include/etl/stack.h b/include/etl/stack.h
index 901e0e62..8c57dbd5 100644
--- a/include/etl/stack.h
+++ b/include/etl/stack.h
@@ -447,8 +447,7 @@ namespace etl
     istack& operator = (istack&& rhs)
     {
       if (&rhs != this)
-      {
-        clear();
+      {        
         clone(etl::move(rhs));
       }
 
@@ -463,6 +462,8 @@ namespace etl
     //*************************************************************************
     void clone(const istack& other)
     {
+      clear();
+
       size_t index = 0;
 
       for (size_t i = 0; i < other.size(); ++i)
@@ -477,6 +478,8 @@ namespace etl
     //*************************************************************************
     void clone(istack&& other)
     {
+      clear();
+
       size_t index = 0;
 
       for (size_t i = 0; i < other.size(); ++i)
diff --git a/include/etl/version.h b/include/etl/version.h
index 07c33a62..3b339338 100644
--- a/include/etl/version.h
+++ b/include/etl/version.h
@@ -39,7 +39,7 @@ SOFTWARE.
 
 #define ETL_VERSION_MAJOR 18
 #define ETL_VERSION_MINOR 12
-#define ETL_VERSION_PATCH  5
+#define ETL_VERSION_PATCH  6
 #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 f024aaba..a7799bed 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "Embedded Template Library",
-  "version": "18.12.5",
+  "version": "18.12.6",
   "authors": {
     "name": "John Wellbelove",
     "email": "john.wellbelove@etlcpp.com"
diff --git a/library.properties b/library.properties
index 6deb9856..dcb166c2 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Embedded Template Library
-version=18.12.5
+version=18.12.6
 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 360d40d4..216d9d4b 100644
--- a/support/Release notes.txt	
+++ b/support/Release notes.txt	
@@ -1,3 +1,7 @@
+===============================================================================
+18.12.6
+Fixed etl::stack top level assignment operator not clearing before copy.
+
 ===============================================================================
 18.12.5
 Fixed issue for incorrect operation of erase(const_iterator, const_iterator) when 
diff --git a/test/test_queue.cpp b/test/test_queue.cpp
index f47a2842..2cf4824c 100644
--- a/test/test_queue.cpp
+++ b/test/test_queue.cpp
@@ -485,6 +485,10 @@ namespace
 
       etl::queue<int, 4> queue2;
 
+      // These should be overwritten.
+      queue2.push(5);
+      queue2.push(6);
+
       queue2 = queue;
 
       CHECK(queue.size() == queue2.size());
diff --git a/test/test_stack.cpp b/test/test_stack.cpp
index e0138830..c1b187fb 100644
--- a/test/test_stack.cpp
+++ b/test/test_stack.cpp
@@ -437,6 +437,10 @@ namespace
 
       etl::stack<int, 4> stack2;
 
+      // These should be overwritten.
+      stack2.push(5);
+      stack2.push(6);
+
       stack2 = stack;
 
       CHECK(stack.size() == stack2.size());