diff --git a/source/RobotAPI/libraries/armem/core/ice_conversions.cpp b/source/RobotAPI/libraries/armem/core/ice_conversions.cpp
index 65425e58daca2b9d8ab3c4f680690cfac55f4158..f942f44f0036c6b826cf91aa765245c450d0cb2b 100644
--- a/source/RobotAPI/libraries/armem/core/ice_conversions.cpp
+++ b/source/RobotAPI/libraries/armem/core/ice_conversions.cpp
@@ -84,6 +84,7 @@ namespace armarx
         fromIce(ice.entityID, update.entityID);
 
         update.instancesData.clear();
+        update.instancesData.reserve(ice.instancesData.size());
         std::transform(ice.instancesData.begin(), ice.instancesData.end(), std::back_inserter(update.instancesData),
                        aron::datanavigator::AronDictDataNavigator::FromAronDict);
 
@@ -98,6 +99,7 @@ namespace armarx
         toIce(ice.entityID, update.entityID);
 
         ice.instancesData.clear();
+        ice.instancesData.reserve(update.instancesData.size());
         std::transform(update.instancesData.begin(), update.instancesData.end(), std::back_inserter(ice.instancesData),
                        aron::datanavigator::AronDictDataNavigator::ToAronDict);