diff --git a/src/high/squirrel.rs b/src/high/squirrel.rs
index cf50c0f..1fc0bf6 100644
--- a/src/high/squirrel.rs
+++ b/src/high/squirrel.rs
@@ -290,7 +290,7 @@ impl<T: 'static> UserData<T> {
     }
 
     /// Creates a new [`UserData<T>`] from boxed data
-    pub fn from_boxed(userdata: Box<T>) -> Self {
+    pub const fn from_boxed(userdata: Box<T>) -> Self {
         Self(userdata)
     }
 }
diff --git a/src/mid/engine/concommands.rs b/src/mid/engine/concommands.rs
index 3bb3d3a..e776fda 100644
--- a/src/mid/engine/concommands.rs
+++ b/src/mid/engine/concommands.rs
@@ -81,12 +81,9 @@ impl RegisterConCommands {
         ) -> ::std::os::raw::c_int,
     ) -> Result<*mut ConCommand, RegisterError> {
         self.mid_register_concommand(name, callback, help_string, flags)
-            .map(move |command| {
-                unsafe {
-                    (*command).m_pCompletionCallback = Some(completion_callback);
-                    (*command).m_nCallbackFlags |= 0x3;
-                }
-                command
+            .inspect(move |command| unsafe {
+                (*(*command)).m_pCompletionCallback = Some(completion_callback);
+                (*(*command)).m_nCallbackFlags |= 0x3;
             })
     }
 }