diff --git a/mods/ENTITIES/mobs_mc/blaze.lua b/mods/ENTITIES/mobs_mc/blaze.lua
index b7a29ecca9..fad7765c3f 100644
--- a/mods/ENTITIES/mobs_mc/blaze.lua
+++ b/mods/ENTITIES/mobs_mc/blaze.lua
@@ -66,7 +66,6 @@ mobs:register_mob("mobs_mc:blaze", {
 	jump = true,
 	jump_height = 4,
 	fly = true,
-	jump_chance = 98,
 	fear_height = 0,
 	glow = 14,
 })
diff --git a/mods/ENTITIES/mobs_mc/ender_dragon.lua b/mods/ENTITIES/mobs_mc/ender_dragon.lua
index 55cce2807e..488c52875b 100644
--- a/mods/ENTITIES/mobs_mc/ender_dragon.lua
+++ b/mods/ENTITIES/mobs_mc/ender_dragon.lua
@@ -33,7 +33,6 @@ mobs:register_mob("mobs_mc:enderdragon", {
 	jump = true,
 	jump_height = 14,
 	stepheight = 1.2,
-	jump_chance = 100,
 	fly = true,
 	fly_in = {"air"},
 	dogshoot_switch = 1,
diff --git a/mods/ENTITIES/mobs_mc/ghast.lua b/mods/ENTITIES/mobs_mc/ghast.lua
index 1e8c3903e2..e783adffa1 100644
--- a/mods/ENTITIES/mobs_mc/ghast.lua
+++ b/mods/ENTITIES/mobs_mc/ghast.lua
@@ -67,7 +67,6 @@ mobs:register_mob("mobs_mc:ghast", {
 	floats=1,
 	fly = true,
 	fly_in = {"air"},
-	jump_chance = 98,
 })
 
 
diff --git a/mods/ENTITIES/mobs_mc/slime+magma_cube.lua b/mods/ENTITIES/mobs_mc/slime+magma_cube.lua
index 23c40f214b..58a15d0398 100644
--- a/mods/ENTITIES/mobs_mc/slime+magma_cube.lua
+++ b/mods/ENTITIES/mobs_mc/slime+magma_cube.lua
@@ -102,7 +102,6 @@ local slime_big = {
 	run_velocity = 2.5,
 	walk_chance = 0,
 	jump_height = 5.2,
-	jump_chance = 100,
 	fear_height = 0,
 	spawn_small_alternative = "mobs_mc:slime_small",
 	on_die = spawn_children_on_die("mobs_mc:slime_small", 4, 1.0, 1.5)
@@ -208,7 +207,6 @@ local magma_cube_big = {
 	jump = true,
 	jump_height = 8,
 	walk_chance = 0,
-	jump_chance = 100,
 	fear_height = 0,
 	spawn_small_alternative = "mobs_mc:magma_cube_small",
 	on_die = spawn_children_on_die("mobs_mc:magma_cube_small", 3, 0.8, 1.5)
diff --git a/mods/ENTITIES/mobs_mc/wither.lua b/mods/ENTITIES/mobs_mc/wither.lua
index e945e40ec1..05997cf70e 100644
--- a/mods/ENTITIES/mobs_mc/wither.lua
+++ b/mods/ENTITIES/mobs_mc/wither.lua
@@ -36,7 +36,6 @@ mobs:register_mob("mobs_mc:wither", {
 	},
 	jump = true,
 	jump_height = 10,
-	jump_chance = 98,
 	fly = true,
 	dogshoot_switch = 1,
 	dogshoot_count_max =1,