diff --git a/eclass/llvm-r1.eclass b/eclass/llvm-r1.eclass
index 55cb0c0cafd0a..f5642bcee68e7 100644
--- a/eclass/llvm-r1.eclass
+++ b/eclass/llvm-r1.eclass
@@ -57,7 +57,7 @@ inherit llvm-utils
 # @DESCRIPTION:
 # Oldest supported LLVM slot.  This is used to automatically filter out
 # unsupported LLVM_COMPAT values.
-_LLVM_OLDEST_SLOT=15
+_LLVM_OLDEST_SLOT=16
 
 # @ECLASS_VARIABLE: _LLVM_NEWEST_STABLE
 # @INTERNAL