diff --git a/nbdkit.spec b/nbdkit.spec
index 79f45be..36f21b9 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -1,6 +1,8 @@
 %global _hardened_build 1
 
-%ifarch aarch64 %{arm} x86_64 ppc %{power64}
+# Broken on {power64} because of
+# https://bugzilla.redhat.com/show_bug.cgi?id=1778520
+%ifarch aarch64 %{arm} x86_64 ppc
 %global have_libguestfs 1
 %endif