diff --git a/lhcbnightlyconf/Gauss.py b/lhcbnightlyconf/Gauss.py
index 7ca9a3f98413ad84b0ee7179bbc2693ebce5a0c0..94fef436d1fde9f7a5aa83133ffb41f374f55b86 100644
--- a/lhcbnightlyconf/Gauss.py
+++ b/lhcbnightlyconf/Gauss.py
@@ -103,8 +103,6 @@ DEV10GH_PLATFORMS = [
 ]
 
 SIM11_PLATFORMS = [
-    'x86_64_v2-el9-gcc12-opt',
-    'x86_64_v2-el9-gcc12-dbg',
     'x86_64_v2-el9-gcc13-opt',
     'x86_64_v2-el9-gcc13-dbg',
 ]