diff --git a/ansible-role-elasticsearch/templates/jvm.options.j2 b/ansible-role-elasticsearch/templates/jvm.options.j2
index 10829b90..576b9cc3 100644
--- a/ansible-role-elasticsearch/templates/jvm.options.j2
+++ b/ansible-role-elasticsearch/templates/jvm.options.j2
@@ -20,7 +20,7 @@
 
 # Xms represents the initial size of total heap space
 # Xmx represents the maximum size of total heap space
-{% if elasticsearch_jvm_xms is defined %}
+{% if elasticsearch_jvm_xms is not none %}
 {% if elasticsearch_jvm_xms < 32000 %}
 -Xms{{ elasticsearch_jvm_xms }}m
 -Xmx{{ elasticsearch_jvm_xms }}m