diff --git a/cext/src/float.cpp b/cext/src/float.cpp
index be1d3e1..ea3ced7 100644
--- a/cext/src/float.cpp
+++ b/cext/src/float.cpp
@@ -147,7 +147,19 @@ jruby_float_value(VALUE v)
 extern "C" VALUE
 rb_Float(VALUE obj)
 {
-    return likely(TYPE(obj) == T_FLOAT) ? obj : callMethodA(obj, "to_f", 0, NULL);
+    if (likely(TYPE(obj) == T_FLOAT)) {
+        return obj;
+    } else {
+        JLocalEnv env;
+        Handle* h = Handle::valueOf(obj);
+        jvalue params[1];
+        params[0].l = h->obj;
+
+        jobject rubyFloat = env->CallStaticObjectMethodA(JRuby_class, JRuby_convertToFloat, params);
+        RubyFloat* f = new RubyFloat(0);
+        f->obj = env->NewGlobalRef(rubyFloat);
+        return (VALUE)f;
+    }
 }

 extern "C" double
diff --git a/cext/src/jruby-cext.cpp b/cext/src/jruby-cext.cpp
index c26dfce..005698a 100644
--- a/cext/src/jruby-cext.cpp
+++ b/cext/src/jruby-cext.cpp
@@ -75,6 +75,7 @@ namespace jruby {
     jmethodID JRuby_getRString;
     jmethodID JRuby_getRArray;
     jmethodID JRuby_newFloat;
+    jmethodID JRuby_convertToFloat;
     jmethodID JRuby_yield;
     jmethodID JRuby_blockGiven;
     jmethodID JRuby_getBlockProc;
@@ -362,6 +363,9 @@ loadIds(JNIEnv* env)
     JRuby_newProc = getStaticMethodID(env, JRuby_class, "newProc",
             "(Lorg/jruby/Ruby;J)Lorg/jruby/runtime/builtin/IRubyObject;");

+    JRuby_convertToFloat = getStaticMethodID(env, JRuby_class, "convertToFloat",
+            "(Lorg/jruby/runtime/builting/IRubyObject;)Lorg/jruby/RubyFloat;");
+
     RubyString_value_field = getFieldID(env, RubyString_class, "value", "Lorg/jruby/util/ByteList;");
     RubyFloat_value_field = getFieldID(env, RubyFloat_class, "value", "D");
     ByteList_bytes_field = getFieldID(env, ByteList_class, "bytes", "[B");
diff --git a/cext/src/jruby.h b/cext/src/jruby.h
index c9b5ffb..92b4d0e 100644
--- a/cext/src/jruby.h
+++ b/cext/src/jruby.h
@@ -109,6 +109,7 @@ namespace jruby {
     extern jmethodID JRuby_clearErrorInfo;
     extern jmethodID JRuby_newString;
     extern jmethodID JRuby_newFloat;
+    extern jmethodID JRuby_convertToFloat;
     extern jmethodID JRuby_ll2inum;
     extern jmethodID JRuby_ull2inum;
     extern jmethodID JRuby_int2big;
diff --git a/src/org/jruby/cext/JRuby.java b/src/org/jruby/cext/JRuby.java
index 6bdfb77..8cba67f 100644
--- a/src/org/jruby/cext/JRuby.java
+++ b/src/org/jruby/cext/JRuby.java
@@ -303,4 +303,8 @@ public class JRuby {
         GIL.acquire(lockCount);
         return task.retval;
     }
+
+    public static RubyFloat convertToFloat(IRubyObject object) {
+        return object.convertToFloat();
+    }
 }