diff --git a/data/campaigns/Under_the_Burning_Suns/units/units.cfg b/data/campaigns/Under_the_Burning_Suns/units/units.cfg
index cf7eb72424d4..d68f0cae2c82 100644
--- a/data/campaigns/Under_the_Burning_Suns/units/units.cfg
+++ b/data/campaigns/Under_the_Burning_Suns/units/units.cfg
@@ -55,7 +55,7 @@
     name=desert_float
     flies=true
     [movement_costs]
-        deep_water=100
+        deep_water={UNREACHABLE}
         shallow_water=1
         reef=1
         swamp_water=1