diff --git a/ChangeLog b/ChangeLog
index e54de237bb..cafd1e708d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Mon Apr 21 18:19:35 2014  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* string.c (coderange_scan): remove unused logic.
+
+	* string.c (rb_str_coderange_scan_restartable): ditto.
+
 Mon Apr 21 14:11:48 2014  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* ext/stringio/stringio.c (strio_putc): fix for non-ascii
diff --git a/string.c b/string.c
index 021e135536..7150791bd2 100644
--- a/string.c
+++ b/string.c
@@ -328,9 +328,6 @@ coderange_scan(const char *p, long len, rb_encoding *enc)
                 }
             }
         }
-        if (e < p) {
-            return ENC_CODERANGE_BROKEN;
-        }
         return ENC_CODERANGE_VALID;
     }
 
@@ -342,9 +339,6 @@ coderange_scan(const char *p, long len, rb_encoding *enc)
         }
         p += MBCLEN_CHARFOUND_LEN(ret);
     }
-    if (e < p) {
-        return ENC_CODERANGE_BROKEN;
-    }
     return ENC_CODERANGE_VALID;
 }
 
@@ -383,7 +377,7 @@ rb_str_coderange_scan_restartable(const char *s, const char *e, rb_encoding *enc
 		}
 	    }
 	}
-	*cr = e < p ? ENC_CODERANGE_BROKEN: ENC_CODERANGE_VALID;
+	*cr = ENC_CODERANGE_VALID;
 	return p - s;
     }
     else {
@@ -395,7 +389,7 @@ rb_str_coderange_scan_restartable(const char *s, const char *e, rb_encoding *enc
 	    }
 	    p += MBCLEN_CHARFOUND_LEN(ret);
 	}
-	*cr = e < p ? ENC_CODERANGE_BROKEN: ENC_CODERANGE_VALID;
+	*cr = ENC_CODERANGE_VALID;
 	return p - s;
     }
 }