diff --git a/slirp4netns.spec b/slirp4netns.spec
index 5e46b0c..5aa41ad 100644
--- a/slirp4netns.spec
+++ b/slirp4netns.spec
@@ -1,4 +1,4 @@
-%global built_tag v1.2.0
+%global built_tag_strip 1.2.0
 
 Name: slirp4netns
 Version: 1.2.0
@@ -12,7 +12,7 @@ License: GPLv2
 %endif
 Summary: slirp for network namespaces
 URL: https://github.com/rootless-containers/%{name}
-Source0: %{url}/archive/%{built_tag}.tar.gz
+Source0: %{url}/archive/v%{built_tag_strip}.tar.gz
 BuildRequires: autoconf
 BuildRequires: automake
 BuildRequires: go-md2man
@@ -47,7 +47,7 @@ building other packages which use import path with
 %{import_path} prefix.
 
 %prep
-%autosetup -Sgit
+%autosetup -Sgit %{name}-%{built_tag_strip}
 
 %build
 ./autogen.sh