diff --git a/fwts.spec b/fwts.spec
index 5d0cf56..f2dd78c 100644
--- a/fwts.spec
+++ b/fwts.spec
@@ -64,7 +64,8 @@ find . -name Makefile.am -exec sed -i "s|-Werror||g"  {} +
 autoreconf -fiv
 %configure \
 	--disable-static
-%make_build
+# parallel build fails on Factory
+%make_build --jobs=1
 
 %install
 %make_install