diff --git a/gamecore/modules/world/actors/actor2D.lua b/gamecore/modules/world/actors/actor2D.lua
index 0427935..37c0c38 100644
--- a/gamecore/modules/world/actors/actor2D.lua
+++ b/gamecore/modules/world/actors/actor2D.lua
@@ -117,27 +117,9 @@ function Actor2D:checkCollision(dx, dy)
   return self.x, self.y, cols, colNumber
 end
 
-function Actor2D:initGravity()
-  if (self.world.gravity.isDefault) then
-    self.grav = self.world.gravity.grav
-  else
-    self.grav = 0
-  end
-
-  self.onGround = false
-end
-
 -- GRAVITY SYSTEM FUNCTIONS
 -- All functions related to gravity
 
-function Actor2D:setGravity(grav)
-  -- It's basically now a function with two roles at once :
-  -- - activate the gravity
-  -- - use the gravity value the dev want
-
-  self.grav = grav or self.world.gravity.grav
-end
-
 function Actor2D:applyGravity(dt)
   self.ysp = self.ysp + self.grav * dt
 
diff --git a/gamecore/modules/world/actors/baseactor.lua b/gamecore/modules/world/actors/baseactor.lua
index 7a1269b..61b7827 100644
--- a/gamecore/modules/world/actors/baseactor.lua
+++ b/gamecore/modules/world/actors/baseactor.lua
@@ -132,6 +132,35 @@ function BaseActor:getViewCenter()
   return self:getCenter()
 end
 
+-- GRAVITY SYSTEM FUNCTIONS
+-- All functions related to gravity
+
+function BaseActor:initGravity()
+  if (self.world.gravity.isDefault) then
+    self.grav = self.world.gravity.grav
+  else
+    self.grav = 0
+  end
+
+  self.onGround = false
+end
+
+function BaseActor:setGravity(grav)
+  -- It's basically now a function with two roles at once :
+  -- - activate the gravity
+  -- - use the gravity value the dev want
+
+  self.grav = grav or self.world.gravity.grav
+end
+
+function BaseActor:applyGravity(dt)
+  -- Empty function in baseactor
+end
+
+function BaseActor:checkGround()
+  -- Empty function in baseactor
+end
+
 -- UPDATE FUNCTIONS
 -- Theses functions are activated every steps