diff --git a/source/Commands/CommandObjectCommands.cpp b/source/Commands/CommandObjectCommands.cpp
index 64f80a0..364c6f5 100644
--- a/source/Commands/CommandObjectCommands.cpp
+++ b/source/Commands/CommandObjectCommands.cpp
@@ -1186,7 +1186,7 @@
     }
     
     virtual bool
-    IsRemovable ()
+    IsRemovable () const
     {
         return true;
     }