diff --git a/Regression/testsuite/main.fmf b/Regression/testsuite/main.fmf
index d238f25..6b4671a 100644
--- a/Regression/testsuite/main.fmf
+++ b/Regression/testsuite/main.fmf
@@ -44,9 +44,9 @@ adjust:
     continue: false
     because: known to fail, won't be fixed (RHBZ#2040688 and others)
   - enabled: false
-    when: collection == gcc-toolset-12 and distro == rhel-9 and distro > rhel-9.2
+    when: collection == gcc-toolset-13 and distro == rhel-8 and distro < rhel-8.10
     continue: false
-    because: known to fail with Clang > 15
+    because: known to fail on experimental installs on older RHEL-8 z-streams
 extra-nitrate: TC#0590691
 extra-summary: /tools/annobin/Regression/testsuite
 extra-task: /tools/annobin/Regression/testsuite