diff --git a/libasn1c.spec b/libasn1c.spec
index edbf43b..9488edc 100644
--- a/libasn1c.spec
+++ b/libasn1c.spec
@@ -69,6 +69,7 @@ applications that want to make use of libasn1c.
 %setup -q
 
 %build
+echo %version >.tarball-version
 autoreconf -fi
 %configure --disable-static
 make %{?_smp_mflags}