diff --git a/ChangeLog b/ChangeLog
index cec5279f57..dc146eea79 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Apr 16 21:27:57 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* ext/bigdecimal/bigdecimal.c (BigDecimal_coerce): revert r23389,
+	  which not only is unnecessary but also causes the inconsistency of
+	  return type.  [ruby-core:25706] [Bug #2129]
+
 Fri Apr 16 20:05:24 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* lib/thread.rb (Queue#push, #pop, SizedQueue#push, #pop): remove
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 9930e63944..2dd3213dca 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -602,14 +602,9 @@ BigDecimal_coerce(VALUE self, VALUE other)
     ENTER(2);
     VALUE obj;
     Real *b;
-    switch (TYPE(other)) {
-      case T_FLOAT:
+    if (TYPE(other) == T_FLOAT) {
 	obj = rb_assoc_new(other, BigDecimal_to_f(self));
-	break;
-      case T_RATIONAL:
-	obj = rb_assoc_new(other, BigDecimal_to_r(self));
-	break;
-      default:
+    } else {
 	GUARD_OBJ(b,GetVpValue(other,1));
 	obj = rb_assoc_new(b->obj, self);
     }