diff --git a/conmon.spec b/conmon.spec
index 09156f8..79ac50d 100644
--- a/conmon.spec
+++ b/conmon.spec
@@ -8,14 +8,13 @@
 %global debug_package %{nil}
 %endif
 
-# Used for comparing with latest upstream tag
-# to decide whether to autobuild
 %global built_tag v2.1.0
 %global built_tag_strip %(b=%{built_tag}; echo ${b:1})
+%global gen_version %(b=%{built_tag_strip}; echo ${b/-/"~"})
 
 Name: conmon
 Epoch: 2
-Version: 2.1.0
+Version: %{gen_version}
 Release: %autorelease
 Summary: OCI container runtime monitor
 License: ASL 2.0