diff --git a/queue.h b/queue.h
index d8a279dc..ef0e43e2 100644
--- a/queue.h
+++ b/queue.h
@@ -87,7 +87,7 @@ namespace etl
     //*************************************************************************
     /// Assignment operator.
     //*************************************************************************
-    queue& operator =(const queue& rhs)
+    queue& operator = (const queue& rhs)
     {
       if (&rhs != this)
       {
diff --git a/stack.h b/stack.h
index c085e2eb..268f36ba 100644
--- a/stack.h
+++ b/stack.h
@@ -87,7 +87,7 @@ namespace etl
     //*************************************************************************
     /// Assignment operator.
     //*************************************************************************
-    stack& operator =(const stack& rhs)
+    stack& operator = (const stack& rhs)
     {
       if (&rhs != this)
       {