diff --git a/libguestfs.spec b/libguestfs.spec
index 29f0830..9433c9b 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -27,7 +27,7 @@
 %global _changelog_trimtime %(date +%s -d "2 years ago")
 
 # Verify tarball signature with GPGv2 (only possible for stable branches).
-%global verify_tarball_signature 1
+%global verify_tarball_signature %{nil}
 
 # Filter perl provides.
 %{?perl_default_filter}