diff --git a/_constraints b/_constraints
index f69361b..d3e02d7 100644
--- a/_constraints
+++ b/_constraints
@@ -7,7 +7,7 @@
       <size unit="M">6000</size>
     </memory>
     <disk>
-      <size unit="G">20</size>
+      <size unit="G">15</size>
     </disk>
   </hardware>
 </constraints>
diff --git a/libreoffice.changes b/libreoffice.changes
index be65356..502b70d 100644
--- a/libreoffice.changes
+++ b/libreoffice.changes
@@ -2,7 +2,7 @@
 Fri Jul 26 10:06:40 UTC 2013 - pmladek@suse.com
 
 - add _constrains to force build on hosts with enough memory (4GB physical RAM,
-  6GB RAM including swap), and disk space (20GB)
+  6GB RAM including swap), and disk space (15GB)
 - print some information about the build environment: free, df, configure
   setting result