diff --git a/roles/mongodb/defaults/main.yml b/roles/mongodb/defaults/main.yml
index 8e98e522e..2553868fb 100644
--- a/roles/mongodb/defaults/main.yml
+++ b/roles/mongodb/defaults/main.yml
@@ -1,2 +1,2 @@
-mongodb_install: True
+mongodb_install: False
 mongodb_enabled: False
diff --git a/roles/mongodb/templates/mongod.conf b/roles/mongodb/templates/mongod.conf
index 82817af3c..7d2aac70e 100644
--- a/roles/mongodb/templates/mongod.conf
+++ b/roles/mongodb/templates/mongod.conf
@@ -98,7 +98,7 @@ dbpath = /library/dbdata/mongodb
 #noIndexBuildRetry = true
 
 # Disable data file preallocation - will often hurt performance (false by default)
-#noprealloc = true
+noprealloc = true
 
 # .ns file size (in MB) for new databases (16 MB by default)
 #nssize = 16