diff --git a/vm_eval.c b/vm_eval.c
index 6a659822a8..b5e72e64c0 100644
--- a/vm_eval.c
+++ b/vm_eval.c
@@ -487,19 +487,18 @@ rb_search_method_entry(VALUE recv, ID mid, VALUE *defined_class_ptr)
     VALUE klass = CLASS_OF(recv);
 
     if (!klass) {
-        VALUE flags, klass;
-        if (IMMEDIATE_P(recv)) {
+        VALUE flags;
+        if (SPECIAL_CONST_P(recv)) {
             rb_raise(rb_eNotImpError,
                      "method `%"PRIsVALUE"' called on unexpected immediate object (%p)",
                      rb_id2str(mid), (void *)recv);
         }
         flags = RBASIC(recv)->flags;
-        klass = RBASIC(recv)->klass;
         if (flags == 0) {
             rb_raise(rb_eNotImpError,
                      "method `%"PRIsVALUE"' called on terminated object"
-                     " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
-                     rb_id2str(mid), (void *)recv, flags, klass);
+                     " (%p flags=0x%"PRIxVALUE")",
+                     rb_id2str(mid), (void *)recv, flags);
         }
         else {
             int type = BUILTIN_TYPE(recv);
@@ -507,18 +506,18 @@ rb_search_method_entry(VALUE recv, ID mid, VALUE *defined_class_ptr)
             if (typestr && T_OBJECT <= type && type < T_NIL)
                 rb_raise(rb_eNotImpError,
                          "method `%"PRIsVALUE"' called on hidden %s object"
-                         " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
-                         rb_id2str(mid), typestr, (void *)recv, flags, klass);
+                         " (%p flags=0x%"PRIxVALUE")",
+                         rb_id2str(mid), typestr, (void *)recv, flags);
             if (typestr)
                 rb_raise(rb_eNotImpError,
                          "method `%"PRIsVALUE"' called on unexpected %s object"
-                         " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
-                         rb_id2str(mid), typestr, (void *)recv, flags, klass);
+                         " (%p flags=0x%"PRIxVALUE")",
+                         rb_id2str(mid), typestr, (void *)recv, flags);
             else
                 rb_raise(rb_eNotImpError,
                          "method `%"PRIsVALUE"' called on broken T_???" "(0x%02x) object"
-                         " (%p flags=0x%"PRIxVALUE" klass=0x%"PRIxVALUE")",
-                         rb_id2str(mid), type, (void *)recv, flags, klass);
+                         " (%p flags=0x%"PRIxVALUE")",
+                         rb_id2str(mid), type, (void *)recv, flags);
         }
     }
     return rb_method_entry(klass, mid, defined_class_ptr);