diff --git a/scripts/e3a/frost.lua b/scripts/e3a/frost.lua
index 235cdc77f..d0a36e9f3 100644
--- a/scripts/e3a/frost.lua
+++ b/scripts/e3a/frost.lua
@@ -16,6 +16,9 @@ end
 
 local function thaw(r)
     r.terrain = "ocean"
+    for s in r.ships do
+        s.coast = nil
+    end
 end
 
 function update()