# Error occurred during initialization of VM Could not reserve enough space for 1048576KB object heap - ElasticSearch

**URL:** <https://discuss.elastic.co/t/error-occurred-during-initialization-of-vm-could-not-reserve-enough-space-for-1048576kb-object-heap-elasticsearch/33999>\
**Category:** Elasticsearch\
**Created:** [November 6, 2015, 2:50pm UTC](https://discuss.elastic.co/t/error-occurred-during-initialization-of-vm-could-not-reserve-enough-space-for-1048576kb-object-heap-elasticsearch/33999 "2015-11-06T14:50:49Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![Prewin](https://avatars.discourse-cdn.com/v4/letter/p/d6d6ee/32.png) [@Prewin](https://discuss.elastic.co/u/Prewin)\
**Post date:** [November 6, 2015, 2:50pm UTC](https://discuss.elastic.co/t/error-occurred-during-initialization-of-vm-could-not-reserve-enough-space-for-1048576kb-object-heap-elasticsearch/33999/1 "2015-11-06T14:50:49Z")

</div>

Goto ElasticSearch bin directory.  
Eg:\ElasticSearch\elasticsearch-2.0.0\bin

Right click elasticsearch.in.bat -\>edit

change

if "%ES\_MAX\_MEM%" == "" (  
set ES\_MAX\_MEM=1g  
)

to

if "%ES\_MAX\_MEM%" == "" (  
set ES\_MAX\_MEM=512m  
)

save & close.

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_[View the full topic](https://discuss.elastic.co/t/error-occurred-during-initialization-of-vm-could-not-reserve-enough-space-for-1048576kb-object-heap-elasticsearch/33999)._