diff --git a/src/game/Mobs.cpp b/src/game/Mobs.cpp
index 273b795..b16f0ae 100644
--- a/src/game/Mobs.cpp
+++ b/src/game/Mobs.cpp
@@ -33,11 +33,11 @@ void Mob::tick(std::uint64_t delta) {
 
 void Mob::updateEffects(std::uint64_t delta) {
     float deltaSec = (float)delta / 1000.0f;
-    for (auto it = m_Effects.begin(); it != m_Effects.end(); it++) {
-        EffectDuration& effect = *it;
+    for (std::size_t i = 0; i < m_Effects.size(); i++) {
+        EffectDuration& effect = m_Effects[i];
         effect.second -= deltaSec;
         if (effect.second < 0)   // effect has gone
-            m_Effects.erase(it);
+            m_Effects.erase(m_Effects.begin() + i);
     }
 }
 
diff --git a/src/game/World.cpp b/src/game/World.cpp
index c282061..f79e573 100644
--- a/src/game/World.cpp
+++ b/src/game/World.cpp
@@ -459,10 +459,10 @@ bool World::CanPlaceBigTower(const glm::vec2& worldPos, PlayerID playerID) const
 }
 
 void World::cleanDeadMobs(){
-    for(auto it = m_Mobs.begin(); it != m_Mobs.end(); it++){
-        MobPtr mob = *it;
+    for(std::size_t i = 0; i < m_Mobs.size(); i++){
+        MobPtr mob = m_Mobs[i];
         if(!mob->isAlive()){
-            m_Mobs.erase(it);
+            m_Mobs.erase(m_Mobs.begin() + i);
         }
     }
 }