diff --git a/ChangeLog b/ChangeLog
index 7233bcc89c..27cce5a49b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Nov 24 01:03:00 2013  Kenta Murata  <mrkn@mrkn.jp>
+
+	* ext/bigdecimal/bigdecimal.c (BigDecimal_power): Use FIX2LONG instead
+	  of FIX2INT to avoid conversion error.
+
 Sun Nov 24 00:44:30 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* include/ruby/ruby.h (RBIGNUM_EMBED_LEN_MAX): define by macros
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index b4656ea0c3..29240c7da4 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2194,7 +2194,7 @@ BigDecimal_power(int argc, VALUE*argv, VALUE self)
 	return ToValue(y);
     }
 
-retry:
+  retry:
     switch (TYPE(vexp)) {
       case T_FIXNUM:
 	break;
@@ -2381,7 +2381,7 @@ retry:
 	}
     }
 
-    int_exp = FIX2INT(vexp);
+    int_exp = FIX2LONG(vexp);
     ma = int_exp;
     if (ma <  0) ma = -ma;
     if (ma == 0) ma = 1;