diff --git a/includes/learnopengl/shader_s.h b/includes/learnopengl/shader_s.h
index 484e0ec49..dcdd645fb 100644
--- a/includes/learnopengl/shader_s.h
+++ b/includes/learnopengl/shader_s.h
@@ -70,7 +70,7 @@ class Shader
     }
     // activate the shader
     // ------------------------------------------------------------------------
-    void use() 
+    void use() const
     { 
         glUseProgram(ID); 
     }