diff --git a/src/object/old_object.cpp b/src/object/old_object.cpp
index d8d15197..10e6b003 100644
--- a/src/object/old_object.cpp
+++ b/src/object/old_object.cpp
@@ -358,7 +358,12 @@ bool COldObject::DamageObject(DamageType type, float force, CObject* killer)
     else if ( Implements(ObjectInterfaceType::Fragile) )
     {
         if ( m_type == OBJECT_BOMB && type != DamageType::Explosive ) return false; // Mine can't be destroyed by shooting
-        if ( m_type == OBJECT_URANIUM ) return false; // UraniumOre is not destroyable (see #777)
+        if ( m_type == OBJECT_URANIUM && (type == DamageType::Fire || type == DamageType::Organic) ) return false; // UraniumOre is not destroyable by shooting or aliens (see #777)
+        if ( m_type == OBJECT_STONE && (type == DamageType::Fire || type == DamageType::Organic) ) return false; // TitaniumOre is not destroyable either
+        // PowerCell, NuclearCell and Titanium are destroyable by shooting, but not by collisions!
+        if ( m_type == OBJECT_METAL && type == DamageType::Collision ) return false;
+        if ( m_type == OBJECT_POWER && type == DamageType::Collision ) return false;
+        if ( m_type == OBJECT_NUCLEAR && type == DamageType::Collision ) return false;
 
         DestroyObject(DestructionType::Explosion, killer);
         return true;