diff --git a/vm_args.c b/vm_args.c
index 63a38dcd34..5075e0edd7 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -513,6 +513,22 @@ fill_keys_values(st_data_t key, st_data_t val, st_data_t ptr)
     return ST_CONTINUE;
 }
 
+static inline int
+ignore_keyword_hash_p(VALUE keyword_hash, const rb_iseq_t * const iseq) {
+    if (keyword_hash == rb_no_keyword_hash) {
+	return 1;
+    } else if (!(iseq->body->param.flags.has_kw) &&
+	      !(iseq->body->param.flags.has_kwrest)) {
+	keyword_hash = rb_check_hash_type(keyword_hash);
+
+	if (!NIL_P(keyword_hash) && RHASH_EMPTY_P(keyword_hash)) {
+	    return 1;
+	}
+    }
+
+    return 0;
+}
+
 static inline VALUE
 get_loc(struct rb_calling_info *calling, const struct rb_call_info *ci)
 {
@@ -533,20 +549,6 @@ rb_warn_last_hash_to_keyword(struct rb_calling_info *calling, const struct rb_ca
     }
 }
 
-static inline void
-rb_warn_keyword_to_last_hash(struct rb_calling_info *calling, const struct rb_call_info *ci)
-{
-    if (calling->recv == Qundef) return;
-    VALUE loc = get_loc(calling, ci);
-    if (NIL_P(loc)) {
-        rb_warn("The keyword argument for `%s' is used as the last parameter", rb_id2name(ci->mid));
-    }
-    else {
-        rb_warn("The keyword argument for `%s' (defined at %s:%d) is used as the last parameter",
-                rb_id2name(ci->mid), RSTRING_PTR(RARRAY_AREF(loc, 0)), FIX2INT(RARRAY_AREF(loc, 1)));
-    }
-}
-
 static int
 setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * const iseq,
 			 struct rb_calling_info *const calling,
@@ -563,7 +565,6 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
     VALUE keyword_hash = Qnil;
     VALUE * const orig_sp = ec->cfp->sp;
     unsigned int i;
-    int k2n_warned = FALSE;
 
     vm_check_canary(ec, orig_sp);
     /*
@@ -619,21 +620,21 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
 	given_argc += RARRAY_LENINT(args->rest) - 1;
         if (kw_flag & VM_CALL_KW_SPLAT) {
             int len = RARRAY_LENINT(args->rest);
-            if (len > 0 && RARRAY_AREF(args->rest, len - 1) == rb_no_keyword_hash) {
+            if (len > 0 && ignore_keyword_hash_p(RARRAY_AREF(args->rest, len - 1), iseq)) {
                 arg_rest_dup(args);
                 rb_ary_pop(args->rest);
                 given_argc--;
                 kw_flag &= ~VM_CALL_KW_SPLAT;
-            }
+	    }
         }
     }
     else {
         if (kw_flag & VM_CALL_KW_SPLAT) {
-            if (args->argv[args->argc-1] == rb_no_keyword_hash) {
+            if (ignore_keyword_hash_p(args->argv[args->argc-1], iseq)) {
                 args->argc--;
                 given_argc--;
                 kw_flag &= ~VM_CALL_KW_SPLAT;
-            }
+	    }
         }
 	args->rest = Qfalse;
     }
@@ -655,12 +656,6 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
     /* argc check */
     if (given_argc < min_argc) {
 	if (given_argc == min_argc - 1 && args->kw_argv) {
-	    /* Warn the following:
-	     * def foo(a, k:1) p [a, k] end
-	     * foo(k:42) #=> [{:k=>42}, 1]
-	     */
-            rb_warn_keyword_to_last_hash(calling, ci);
-	    k2n_warned = TRUE;
 	    args_stored_kw_argv_to_hash(args);
 	    given_argc = args_argc(args);
 	}
@@ -702,16 +697,6 @@ setup_parameters_complex(rb_execution_context_t * const ec, const rb_iseq_t * co
 	    }
 	}
     }
-    else if (!k2n_warned &&
-	    !((kw_flag & VM_CALL_KWARG) && iseq->body->param.flags.has_kw) &&
-	    given_argc == min_argc + 1 &&
-	    (kw_flag & (VM_CALL_KWARG | VM_CALL_KW_SPLAT))) {
-	/* Warn the following:
-	 * def foo(x, opt=1) p [x]; end
-	 * foo(k:42) #=> [{:k=>42}]
-	 */
-        rb_warn_keyword_to_last_hash(calling, ci);
-    }
 
     if (given_argc > max_argc && max_argc != UNLIMITED_ARGUMENTS) {
 	if (arg_setup_type == arg_setup_block) {
@@ -897,14 +882,6 @@ vm_caller_setup_arg_kw(rb_control_frame_t *cfp, struct rb_calling_info *calling,
     VALUE *sp = cfp->sp;
     int i;
 
-    /* Warn the following:
-     * def foo(x) p [x] end
-     * foo(k:42) #=> [{:k=>42}]
-     */
-    if (!cfunc) {
-        rb_warn_keyword_to_last_hash(calling, ci);
-    }
-
     for (i=0; i<kw_len; i++) {
 	rb_hash_aset(h, passed_keywords[i], (sp - kw_len)[i]);
     }