diff --git a/src/dynamic_data/script_handling/mod.rs b/src/dynamic_data/script_handling/mod.rs
index 70dadc1..4e864af 100644
--- a/src/dynamic_data/script_handling/mod.rs
+++ b/src/dynamic_data/script_handling/mod.rs
@@ -180,9 +180,9 @@ mod tests {
             0
         }
 
-        fn add_suppression(&self) {}
+        fn add_suppression(&mut self) {}
 
-        fn remove_suppression(&self) {}
+        fn remove_suppression(&mut self) {}
 
         fn on_initialize(&mut self, _pars: &[EffectParameter]) {
             self.test_count += 1;
diff --git a/src/dynamic_data/script_handling/script.rs b/src/dynamic_data/script_handling/script.rs
index 2ac0fb3..117a7c5 100644
--- a/src/dynamic_data/script_handling/script.rs
+++ b/src/dynamic_data/script_handling/script.rs
@@ -1,4 +1,6 @@
+use crate::dynamic_data::choices::TurnChoice;
 use crate::dynamic_data::models::damage_source::DamageSource;
+use crate::dynamic_data::models::executing_move::ExecutingMove;
 use crate::dynamic_data::models::pokemon::Pokemon;
 use crate::static_data::moves::secondary_effect::EffectParameter;
 use crate::StringKey;
@@ -14,24 +16,30 @@ pub trait Script {
         self.get_suppressed_count() > 0
     }
     fn get_suppressed_count(&self) -> usize;
-    fn add_suppression(&self);
-    fn remove_suppression(&self);
+    fn add_suppression(&mut self);
+    fn remove_suppression(&mut self);
 
-    // FIXME: add missing parameters
-    fn stack(&self) {}
-    fn on_remove(&self) {}
+    // FIXME: add missing parameters, and make all these mut
+    fn stack(&mut self) {}
+    fn on_remove(&mut self) {}
     fn on_initialize(&mut self, _pars: &[EffectParameter]) {}
-    fn on_before_turn(&self) {}
-    fn change_speed(&self) {}
-    fn change_priority(&self) {}
-    fn change_attack(&self) {}
-    fn change_number_of_hits(&self) {}
-    fn prevent_attack(&self) {}
-    fn fail_attack(&self) {}
-    fn stop_before_attack(&self) {}
-    fn on_before_attack(&self) {}
-    fn fail_incoming_attack(&self) {}
-    fn is_invulnerable(&self) {}
+    fn on_before_turn(&mut self, _choice: &TurnChoice) {}
+    fn change_speed(&mut self, _choice: &TurnChoice, _speed: &mut u32) {}
+    fn change_priority(&mut self, _choice: &TurnChoice, _priority: &mut i8) {}
+    fn change_attack(&mut self, _choice: &TurnChoice, _moveName: &mut StringKey) {}
+    fn change_number_of_hits(&mut self, _choice: &TurnChoice, _numberOfHits: &mut u8) {}
+    fn prevent_attack(&mut self, _move: &ExecutingMove, _prevent: &mut bool) {}
+    fn fail_attack(&mut self, _move: &ExecutingMove, _fail: &mut bool) {}
+    fn stop_before_attack(&mut self, _move: &ExecutingMove, _stop: &mut bool) {}
+    fn on_before_attack(&mut self, _move: &ExecutingMove) {}
+    fn fail_incoming_attack(&mut self, _move: &ExecutingMove, target: &Pokemon, _fail: &mut bool) {}
+    fn is_invulnerable(
+        &mut self,
+        _move: &ExecutingMove,
+        target: &Pokemon,
+        _invulnerable: &mut bool,
+    ) {
+    }
     fn on_attack_miss(&self) {}
     fn change_attack_type(&self) {}
     fn block_critical(&self) {}