diff --git a/landlock.cpp b/landlock.cpp
index 725790ed..5e204c20 100644
--- a/landlock.cpp
+++ b/landlock.cpp
@@ -187,6 +187,7 @@ EX bool incompatible1(eLand l1, eLand l2) {
   if(l1 == laWarpSea && l2 == laKraken) return true;
   if(l1 == laPrairie && l2 == laCrossroads3) return true;
   if(l1 == laWet && l2 == laDesert) return true;
+  if(l1 == laFrog && l2 == laMotion) return true;
   if(isElemental(l1) && isElemental(l2)) return true;
   return false;
   }