diff --git a/catatonit.spec b/catatonit.spec
index 603cb42..080cec1 100644
--- a/catatonit.spec
+++ b/catatonit.spec
@@ -29,6 +29,7 @@ signalfd(2)) and has no additional features.
 
 %prep
 %autosetup -Sgit -n %{name}-%{built_tag_strip}
+sed -i '$d' configure.ac
 
 %build
 autoreconf -fi