1 files changed, 5 insertions, 2 deletions
diff --git a/jit.c b/jit.c
index a886b66278..ae592b2205 100644
--- a/jit.c
+++ b/jit.c
@@ -52,8 +52,11 @@ rb_iseq_pc_at_idx(const rb_iseq_t *iseq, uint32_t insn_idx)
 int
 rb_iseq_opcode_at_pc(const rb_iseq_t *iseq, const VALUE *pc)
 {
-    // YJIT should only use iseqs after AST to bytecode compilation
-    RUBY_ASSERT_ALWAYS(FL_TEST_RAW((VALUE)iseq, ISEQ_TRANSLATED));
+    // YJIT should only use iseqs after AST to bytecode compilation.
+    // (Certain non-default interpreter configurations never set ISEQ_TRANSLATED)
+    if (OPT_DIRECT_THREADED_CODE || OPT_CALL_THREADED_CODE) {
+        RUBY_ASSERT_ALWAYS(FL_TEST_RAW((VALUE)iseq, ISEQ_TRANSLATED));
+    }
 
     const VALUE at_pc = *pc;
     return rb_vm_insn_addr2opcode((const void *)at_pc);