diff --git a/common/utf8.cpp b/common/utf8.cpp
index c9a2e60d1b..f449d10885 100644
--- a/common/utf8.cpp
+++ b/common/utf8.cpp
@@ -232,5 +232,5 @@ UTF8& UTF8::operator+=( unsigned w_ch )
         m_s += substr.m_s;
     }
 
-    return (UTF8&) *this;
+    return *this;
 }
diff --git a/include/tool/tool_event.h b/include/tool/tool_event.h
index c1fcbac5b3..4577a8ef76 100644
--- a/include/tool/tool_event.h
+++ b/include/tool/tool_event.h
@@ -578,6 +578,9 @@ public:
         m_events.push_back( aSingleEvent );
     }
 
+    ///> Copy an existing TOOL_EVENT_LIST
+    TOOL_EVENT_LIST( const TOOL_EVENT_LIST& aEventList ) = default;
+
     /**
      * Function Format()
      * Returns information about event in form of a human-readable string.
diff --git a/include/utf8.h b/include/utf8.h
index 3591f1aff3..3360bc85ea 100644
--- a/include/utf8.h
+++ b/include/utf8.h
@@ -128,21 +128,21 @@ public:
     {
         m_s += str.m_s;
         MAYBE_VERIFY_UTF8( c_str() );
-        return (UTF8&) *this;
+        return *this;
     }
 
     UTF8& operator+=( char ch )
     {
         m_s.operator+=( ch );
         MAYBE_VERIFY_UTF8( c_str() );
-        return (UTF8&) *this;
+        return *this;
     }
 
     UTF8& operator+=( const char* s )
     {
         m_s.operator+=( s );
         MAYBE_VERIFY_UTF8( c_str() );
-        return (UTF8&) *this;
+        return *this;
     }
 
     /// Append a wide (unicode) char to the UTF8 string.
diff --git a/libs/kimath/include/geometry/shape_line_chain.h b/libs/kimath/include/geometry/shape_line_chain.h
index 0c6e7a8019..4948a34915 100644
--- a/libs/kimath/include/geometry/shape_line_chain.h
+++ b/libs/kimath/include/geometry/shape_line_chain.h
@@ -118,6 +118,8 @@ public:
     virtual ~SHAPE_LINE_CHAIN()
     {}
 
+    SHAPE_LINE_CHAIN& operator=(const SHAPE_LINE_CHAIN&) = default;
+
     SHAPE* Clone() const override;
 
     /**
diff --git a/libs/kimath/include/math/vector2d.h b/libs/kimath/include/math/vector2d.h
index 03254919f0..28b3acf264 100644
--- a/libs/kimath/include/math/vector2d.h
+++ b/libs/kimath/include/math/vector2d.h
@@ -107,6 +107,13 @@ public:
         y = (T) aVec.y;
     }
 
+    /// Copy a vector
+    VECTOR2( const VECTOR2<T>& aVec )
+    {
+        x = aVec.x;
+        y = aVec.y;
+    }
+
     /// Casts a vector to another specialized subclass. Beware of rouding
     /// issues.
     template <typename CastedType>