diff --git a/aardvark-dns.spec b/aardvark-dns.spec
index 2f1d5d8..3a669bf 100644
--- a/aardvark-dns.spec
+++ b/aardvark-dns.spec
@@ -5,11 +5,11 @@
 %global debug_package %{nil}
 
 %global built_tag v1.2.0
-%global built_tag_strip 1.2.0
+%global built_tag_strip %(b=%{built_tag}; echo ${b:1})
 %global gen_version %(b=%{built_tag_strip}; echo ${b/-/"~"})
 
 Name: aardvark-dns
-Version: 1.2.0
+Version: %{gen_version}
 License: ASL 2.0 and BSD and MIT
 Release: %autorelease
 ExclusiveArch: %{rust_arches}