diff --git a/game/server/physics.cpp b/game/server/physics.cpp
index 2adc5587..8d2c54d4 100644
--- a/game/server/physics.cpp
+++ b/game/server/physics.cpp
@@ -242,8 +242,8 @@ void CPhysicsHook::LevelInitPreEntity()
 	physenv->EnableConstraintNotify( true ); // callback when an object gets deleted that is attached to a constraint
 
 	physenv->SetObjectEventHandler( &g_Collisions );
-	
-	physenv->SetSimulationTimestep( DEFAULT_TICK_INTERVAL ); // 15 ms per tick
+
+	physenv->SetSimulationTimestep( gpGlobals->interval_per_tick ); // 15 ms per tick
 	// HL Game gravity, not real-world gravity
 	physenv->SetGravity( Vector( 0, 0, -GetCurrentGravity() ) );
 	g_PhysAverageSimTime = 0;
@@ -1606,7 +1606,7 @@ CON_COMMAND( physics_budget, "Times the cost of each active object" )
 		float totalTime = 0.f;
 		g_Collisions.BufferTouchEvents( true );
 		float full = engine->Time();
-		physenv->Simulate( DEFAULT_TICK_INTERVAL );
+		physenv->Simulate( gpGlobals->interval_per_tick );
 		full = engine->Time() - full;
 		float lastTime = full;
 
@@ -1623,7 +1623,7 @@ CON_COMMAND( physics_budget, "Times the cost of each active object" )
 				PhysForceEntityToSleep( ents[j], ents[j]->VPhysicsGetObject() );
 			}
 			float start = engine->Time();
-			physenv->Simulate( DEFAULT_TICK_INTERVAL );
+			physenv->Simulate( gpGlobals->interval_per_tick );
 			float end = engine->Time();
 
 			float elapsed = end - start;