diff --git a/strafe-client/src/session.rs b/strafe-client/src/session.rs
index 7cccf38..4503aa1 100644
--- a/strafe-client/src/session.rs
+++ b/strafe-client/src/session.rs
@@ -286,11 +286,11 @@ impl InstructionConsumer<Instruction<'_>> for Session{
 					ViewState::Play=>{
 						// allow simulation timescale for fun
 						let scale=self.simulation.timer.get_scale();
-						self.simulation.timer.set_scale(ins.time,scale*5/4);
+						self.simulation.timer.set_scale(ins.time,strafesnet_common::integer::Ratio64::new(scale.num()*5,scale.den()*4).unwrap());
 					},
 					ViewState::Replay(bot_id)=>if let Some(replay)=self.replays.get_mut(bot_id){
 						let scale=replay.simulation.timer.get_scale();
-						replay.simulation.timer.set_scale(ins.time,scale*5/4);
+						replay.simulation.timer.set_scale(ins.time,strafesnet_common::integer::Ratio64::new(scale.num()*5,scale.den()*4).unwrap());
 					},
 				}
 			},
@@ -299,11 +299,11 @@ impl InstructionConsumer<Instruction<'_>> for Session{
 					ViewState::Play=>{
 						// allow simulation timescale for fun
 						let scale=self.simulation.timer.get_scale();
-						self.simulation.timer.set_scale(ins.time,scale*4/5);
+						self.simulation.timer.set_scale(ins.time,strafesnet_common::integer::Ratio64::new(scale.num()*4,scale.den()*5).unwrap());
 					},
 					ViewState::Replay(bot_id)=>if let Some(replay)=self.replays.get_mut(bot_id){
 						let scale=replay.simulation.timer.get_scale();
-						replay.simulation.timer.set_scale(ins.time,scale*4/5);
+						replay.simulation.timer.set_scale(ins.time,strafesnet_common::integer::Ratio64::new(scale.num()*4,scale.den()*5).unwrap());
 					},
 				}
 			},