diff --git a/widelands.spec b/widelands.spec
index e2427db..75e7ed5 100644
--- a/widelands.spec
+++ b/widelands.spec
@@ -1,6 +1,6 @@
 # norootforbuild
 
-%define build_id build-13
+%define build_id build13
 
 Name:           widelands
 Version:        13
@@ -33,7 +33,7 @@ perhaps will have a thought, what Widelands is all about.
 
 
 %prep
-%setup -q -n %{name}
+%setup -q -n %{name}-b13
 %patch0 -p0
 sed -i 's#flagi#%{optflags}##' build/scons-tools/scons_configure.py