1 files changed, 7 insertions, 1 deletions
diff --git a/marshal.c b/marshal.c
index 744267afaf..26ac51401f 100644
--- a/marshal.c
+++ b/marshal.c
@@ -1479,7 +1479,13 @@ r_symreal(struct load_arg *arg, int ivar)
 	    idx = sym2encidx(sym, r_object(arg));
 	}
     }
-    if (idx > 0) rb_enc_associate_index(s, idx);
+    if (idx > 0) {
+        rb_enc_associate_index(s, idx);
+        if (rb_enc_str_coderange(s) == ENC_CODERANGE_BROKEN) {
+            rb_raise(rb_eArgError, "invalid byte sequence in %s: %+"PRIsVALUE,
+                     rb_enc_name(rb_enc_from_index(idx)), s);
+        }
+    }
 
     return s;
 }