diff --git a/src/ColorScheme.h b/src/ColorScheme.h
index 33639418..d76301a5 100644
--- a/src/ColorScheme.h
+++ b/src/ColorScheme.h
@@ -77,6 +77,7 @@ public:
      */
     ColorScheme();
     ColorScheme(const ColorScheme &other);
+    ColorScheme& operator=(const ColorScheme &other) = delete;
     ~ColorScheme();
 
     /** Sets the descriptive name of the color scheme. */