diff --git a/lib/JIT.php b/lib/JIT.php
index b31a0646..0b900830 100644
--- a/lib/JIT.php
+++ b/lib/JIT.php
@@ -457,11 +457,8 @@ private function isLiteralIncludeDiscoveryRealLoweringMethod(string $lower): boo
     /** ConstStringFolder methods with safe LLVM 9 lowering during self-host AOT (#816). */
     private function isConstStringFolderRealLoweringMethod(string $lower): bool
     {
-        return str_ends_with($lower, '::literalstringvalue')
-            || str_ends_with($lower, '::sourcedir')
-            || str_ends_with($lower, '::fold')
-            || str_ends_with($lower, '::funccallhasarity')
-            || str_ends_with($lower, '::foldcallargstring');
+        // ConstStringFolder real lowering hits ICmp type mismatches in full self-host probe (#1097).
+        return false;
     }
 
     private function collectStubFunctionArgTypes(Block $block): array