diff --git a/src/pyson.js b/src/pyson.js
index 266ec882bf..21ac3ac734 100644
--- a/src/pyson.js
+++ b/src/pyson.js
@@ -218,6 +218,8 @@
                     value.v.second() || value.v.millisecond());
         } else if (moment.isDuration(value.v)) {
             return Boolean(value.v.valueOf());
+        } else if (value.v instanceof Number) {
+            return Boolean(value.v.valueOf());
         } else if (value.v instanceof Object) {
             return !jQuery.isEmptyObject(value.v);
         } else {
diff --git a/tests/sao.js b/tests/sao.js
index 6b00031245..194f90f5f9 100644
--- a/tests/sao.js
+++ b/tests/sao.js
@@ -173,6 +173,10 @@
                 .decode(eval_), false, "decode(Bool(Sao.TimeDelta()))");
         QUnit.strictEqual(new Sao.PYSON.Decoder({value: Sao.TimeDelta(1)})
                 .decode(eval_), true, "decode(Bool(Sao.TimeDelta(1)))");
+        QUnit.strictEqual(new Sao.PYSON.Decoder({value: new Sao.Decimal(0)})
+                .decode(eval_), false, "decode(Bool(Sao.Decimal(0)))");
+        QUnit.strictEqual(new Sao.PYSON.Decoder({value: new Sao.Decimal(1)})
+                .decode(eval_), true, "decode(Bool(Sao.Decimal(1)))");
 
         QUnit.strictEqual(new Sao.PYSON.Bool('test').toString(),
                 "Bool(\"test\")");