diff --git a/easystacks/pilot.nessi.no/2023.06/eessi-2023.06-eb-4.9.0-2023a.yml b/easystacks/pilot.nessi.no/2023.06/eessi-2023.06-eb-4.9.0-2023a.yml
index 16b9c74663..59a2191128 100644
--- a/easystacks/pilot.nessi.no/2023.06/eessi-2023.06-eb-4.9.0-2023a.yml
+++ b/easystacks/pilot.nessi.no/2023.06/eessi-2023.06-eb-4.9.0-2023a.yml
@@ -55,3 +55,9 @@ easyconfigs:
   - GPAW-23.9.1-foss-2023a.eb
   - LittleCMS-2.15-GCCcore-12.3.0.eb
       # This easyconfig is added to overcome the failing of check_missing_installations against the development branch
+  # purpose of the following is to test one case in PR #299
+  #   case is "(C) build software with an un-merged EasyBuild easyconfig PR
+  #   -> should lead to a FAILURE with descriptive message"
+  - pyGAM-0.9.1-gfbf-2023a.eb:
+      options:
+        from-pr: 20308