diff --git a/libgtop.spec.in b/libgtop.spec.in
index 85b2e657..e0f34acb 100644
--- a/libgtop.spec.in
+++ b/libgtop.spec.in
@@ -1,6 +1,7 @@
 # Note that this is NOT a relocatable package
 %define ver      @VERSION@
-%define rel      SNAP
+%define  RELEASE SNAP
+%define  rel     %{?CUSTOM_RELEASE} %{!?CUSTOM_RELEASE:%RELEASE}
 %define prefix   /usr
 
 Summary: LibGTop library