diff --git a/Engine.Physics2D/PhysicsEngine2D.cs b/Engine.Physics2D/PhysicsEngine2D.cs
index 217396e..bbe6f59 100644
--- a/Engine.Physics2D/PhysicsEngine2D.cs
+++ b/Engine.Physics2D/PhysicsEngine2D.cs
@@ -74,7 +74,7 @@ public class PhysicsEngine2D : IPhysicsEngine2D
                     if (bothCollidersAreTriggers)
                         continue;
 
-                    bool bothCollidersAreStatic = colliderX.RigidBody2D?.IsStatic ?? true && colliderX.RigidBody2D?.IsStatic == colliderY.RigidBody2D?.IsStatic;
+                    bool bothCollidersAreStatic = (colliderX.RigidBody2D?.IsStatic ?? true) && (colliderY.RigidBody2D?.IsStatic ?? true);
                     if (bothCollidersAreStatic)
                         continue;
 
diff --git a/Engine.Physics2D/PhysicsEngine2DCollector.cs b/Engine.Physics2D/PhysicsEngine2DCollector.cs
index 0f6abc2..0cc06f2 100644
--- a/Engine.Physics2D/PhysicsEngine2DCollector.cs
+++ b/Engine.Physics2D/PhysicsEngine2DCollector.cs
@@ -56,7 +56,7 @@ public class PhysicsEngine2DCollector : HierarchyObjectBase, IPhysicsEngine2D
                     if (bothCollidersAreTriggers)
                         continue;
 
-                    bool bothCollidersAreStatic = colliderX.RigidBody2D?.IsStatic ?? true && colliderX.RigidBody2D?.IsStatic == colliderY.RigidBody2D?.IsStatic;
+                    bool bothCollidersAreStatic = (colliderX.RigidBody2D?.IsStatic ?? true) && (colliderY.RigidBody2D?.IsStatic ?? true);
                     if (bothCollidersAreStatic)
                         continue;