diff --git a/_constraints b/_constraints
new file mode 100644
index 0000000..39eb33d
--- /dev/null
+++ b/_constraints
@@ -0,0 +1,8 @@
+<constraints>
+    <hardware>
+      <memory>
+        <size unit="G">4</size>
+      </memory>
+    </hardware>
+</constraints>
+
diff --git a/cadabra2.changes b/cadabra2.changes
index bb0f600..bc2da63 100644
--- a/cadabra2.changes
+++ b/cadabra2.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Fri Feb  2 21:21:57 UTC 2018 - stefan.bruens@rwth-aachen.de
+
+- Add a memory _constraints, builds fail with less than 4 GByte
+
 -------------------------------------------------------------------
 Sat Jan 27 22:08:29 UTC 2018 - badshah400@gmail.com
 
diff --git a/cadabra2.spec b/cadabra2.spec
index 32fd75c..2c1f05f 100644
--- a/cadabra2.spec
+++ b/cadabra2.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package cadabra2
 #
-# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2018 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed