diff --git a/Combinatorial_map/include/CGAL/Combinatorial_map.h b/Combinatorial_map/include/CGAL/Combinatorial_map.h
index 9362ef469f9..f0c4f3ad589 100644
--- a/Combinatorial_map/include/CGAL/Combinatorial_map.h
+++ b/Combinatorial_map/include/CGAL/Combinatorial_map.h
@@ -459,7 +459,7 @@ namespace CGAL {
     }
 
     // Copy constructor from a map having exactly the same type.
-    Combinatorial_map_base (const Self & amap)
+    Combinatorial_map_base (const Self & amap): Combinatorial_map_base()
     { copy(amap); }
 
     // "Copy constructor" from a map having different type.
diff --git a/Generalized_map/include/CGAL/Generalized_map.h b/Generalized_map/include/CGAL/Generalized_map.h
index 5d344bef9f2..d85cd773266 100644
--- a/Generalized_map/include/CGAL/Generalized_map.h
+++ b/Generalized_map/include/CGAL/Generalized_map.h
@@ -423,7 +423,7 @@ namespace CGAL {
     }
 
     // Copy constructor from a map having exactly the same type.
-    Generalized_map_base (const Self & amap) : Generalized_map_base()
+    Generalized_map_base(const Self & amap) : Generalized_map_base()
     { copy(amap); }
 
     // "Copy constructor" from a map having different type.