diff --git a/mjit.c b/mjit.c
index 2ee9225cf7..e1eb913aba 100644
--- a/mjit.c
+++ b/mjit.c
@@ -250,8 +250,7 @@ static inline int
 mjit_target_iseq_p(struct rb_iseq_constant_body *body)
 {
     return (body->type == ISEQ_TYPE_METHOD || body->type == ISEQ_TYPE_BLOCK)
-        && !body->builtin_inline_p
-        && body->iseq_size < JIT_ISEQ_SIZE_THRESHOLD;
+        && !body->builtin_inline_p;
 }
 
 static void
diff --git a/mjit.h b/mjit.h
index 986a3adb92..8cfc3d05b7 100644
--- a/mjit.h
+++ b/mjit.h
@@ -101,10 +101,6 @@ extern struct mjit_cont *mjit_cont_new(rb_execution_context_t *ec);
 extern void mjit_cont_free(struct mjit_cont *cont);
 extern void mjit_mark_cc_entries(const struct rb_iseq_constant_body *const body);
 
-// A threshold used to reject long iseqs from JITting as such iseqs
-// takes too much time to be compiled.
-#define JIT_ISEQ_SIZE_THRESHOLD 1000
-
 #  ifdef MJIT_HEADER
 NOINLINE(static COLDFUNC VALUE mjit_exec_slowpath(rb_execution_context_t *ec, const rb_iseq_t *iseq, struct rb_iseq_constant_body *body));
 #  else