diff --git a/src/engine/net/client/handlers/ChangeAltitudeHandler.java b/src/engine/net/client/handlers/ChangeAltitudeHandler.java
index cdc2ea99..1df771f8 100644
--- a/src/engine/net/client/handlers/ChangeAltitudeHandler.java
+++ b/src/engine/net/client/handlers/ChangeAltitudeHandler.java
@@ -46,6 +46,8 @@ public class ChangeAltitudeHandler extends AbstractClientMsgHandler {
             return false;
         if (pc.region != null && !pc.region.isOutside())
             return false;
+        if(pc.speedMod > 0)
+            return false;
 
 
         // Find out if we already have an altitude timer running and if so