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@@ -664,6 +664,10 @@ namespace rubinius {
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     return Float::coerce(state, this)->le(state, b);
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   }
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+  Float* Bignum::to_f(STATE) {
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+    return Float::coerce(state, this);
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+  }
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+
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   int Bignum::to_int(STATE) {
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     if(MP(this)->sign == MP_NEG) {
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       return -mp_get_int(MP(this));

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@@ -136,6 +136,9 @@ namespace rubinius {
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     // Ruby.primitive! :bignum_le
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     OBJECT le(STATE, Float* b);
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+    // Ruby.primitive :bignum_to_f
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+    Float* to_f(STATE);
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+
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     int    to_int(STATE);
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     int    to_i(STATE);
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     native_int to_nint();

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@@ -24,7 +24,6 @@ namespace rubinius {
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     static Float* create(STATE, double val);
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     static Float* coerce(STATE, OBJECT value);
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     double to_double(STATE) { return val; }
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-    double to_double() { return val; }
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     void into_string(STATE, char* buf, size_t sz);
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     // Ruby.primitive! :float_add

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@@ -420,6 +420,10 @@ class TestBignum : public CxxTest::TestSuite {
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     TS_ASSERT_EQUALS(Bignum::create(state, -3)->le(state, Float::create(state, -3.1)), Qfalse);
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   }
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+  void test_to_f() {
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+    check_float(b1->to_f(state), Float::create(state, 2147483647.0));
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+  }
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+
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   void test_from_double() {
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     OBJECT s = Bignum::from_double(state, 1.0);
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     TS_ASSERT(s->fixnum_p());