diff --git a/ColoredSquare.c b/ColoredSquare.c
index 3b549c6..06a229b 100644
--- a/ColoredSquare.c
+++ b/ColoredSquare.c
@@ -15,13 +15,13 @@ void ColoredSquare_constructor (ColoredSquare *this,
   this->color = color;
 }
 
-void ColoredSquare_copy (ColoredSquare *to, const ColoredSquare *from)
+void ColoredSquare_copy (ColoredSquare *dest, const ColoredSquare *src)
 {
   printf ("ColoredSquare_copy (%lu, %lu) called\n",
-          (unsigned long) to,
-          (unsigned long) from);
-  Square_copy ((Square *) to, (Square *) from);
-  to->color = from->color;
+          (unsigned long) dest,
+          (unsigned long) src);
+  Square_copy ((Square *) dest, (Square *) src);
+  dest->color = src->color;
 }
 
 ColoredSquare* ColoredSquare_clone (const ColoredSquare *this)
diff --git a/ColoredSquare.h b/ColoredSquare.h
index c57e012..fc54ba1 100644
--- a/ColoredSquare.h
+++ b/ColoredSquare.h
@@ -24,7 +24,7 @@ typedef struct ColoredSquare_interface
 void ColoredSquare_constructor (struct ColoredSquare *this,
                                 double a,
                                 int color);
-void ColoredSquare_copy (struct ColoredSquare *to, const struct ColoredSquare *from);
+void ColoredSquare_copy (struct ColoredSquare *dest, const struct ColoredSquare *src);
 struct ColoredSquare* ColoredSquare_clone (const struct ColoredSquare *this);
 const char* ColoredSquare_type (const struct ColoredSquare *this);
 void ColoredSquare_draw (const struct ColoredSquare *this);
diff --git a/Square.c b/Square.c
index 83f298b..558ae6b 100644
--- a/Square.c
+++ b/Square.c
@@ -17,12 +17,12 @@ void Square_destructor (Square *this)
           (unsigned long) this);
 }
 
-void Square_copy (Square *to, const Square *from)
+void Square_copy (Square *dest, const Square *src)
 {
   printf ("Square_copy (%lu, %lu) called\n",
-          (unsigned long) to,
-          (unsigned long) from);
-  to->a = from->a;
+          (unsigned long) dest,
+          (unsigned long) src);
+  dest->a = src->a;
 }
 
 Square* Square_clone (const Square *this)
diff --git a/Square.h b/Square.h
index 253f681..49c057f 100644
--- a/Square.h
+++ b/Square.h
@@ -22,7 +22,7 @@ typedef struct Square_interface
 
 void Square_constructor (struct Square *this, double a);
 void Square_destructor (struct Square *this);
-void Square_copy (struct Square *to, const struct Square *from);
+void Square_copy (struct Square *dest, const struct Square *src);
 struct Square* Square_clone (const struct Square *this);
 void Square_destroy (struct Square *this);
 const char* Square_type (const struct Square *this);