diff --git a/glance/files/pike/glance-registry.conf.Debian b/glance/files/pike/glance-registry.conf.Debian
index 9657420..5bab699 100644
--- a/glance/files/pike/glance-registry.conf.Debian
+++ b/glance/files/pike/glance-registry.conf.Debian
@@ -341,6 +341,9 @@
 # Minimum value: 1
 # Maximum value: 9223372036854775808
 #image_size_cap = 1099511627776
+{%- if server.image_size_cap is defined %}
+image_size_cap = {{ server.image_size_cap }}
+{%- endif %}
 
 #
 # Maximum amount of image storage per tenant.