diff --git a/Cargo.toml b/Cargo.toml
index 4af5bac9e1c6f4b9753b0dcac95ec96d40c550a6..4c61dd7e770f49547574e442a3dafc71eec3a900 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,6 @@
 name = "openssl"
 version = "0.0.0"
 authors = ["Steven Fackler <sfackler@gmail.com"]
-build = "make"
 
 [lib]
 
diff --git a/Makefile b/Makefile
index 5e496b3a100b0d60ad0fcc82aaaf87284f86342a..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +0,0 @@
-ifneq ($(findstring i686,$(TARGET)),)
-	CFLAGS += -m32
-else
-	CFLAGS += -m64
-endif
-
-default:
-	$(CC) $(CFLAGS) -c native/bn_is_zero.c -o $(OUT_DIR)/bn_is_zero.o
-	$(AR) crus $(OUT_DIR)/libwrapped.a $(OUT_DIR)/bn_is_zero.o
diff --git a/src/bn/mod.rs b/src/bn/mod.rs
index fb836a395c619891388c62cc6ed3945f0d0e89d4..129f6b904e2c07a410fa3efab2ed6274540bdcea 100644
--- a/src/bn/mod.rs
+++ b/src/bn/mod.rs
@@ -1,4 +1,4 @@
-use libc::{c_int, c_ulong};
+use libc::{c_int, c_ulong, c_void};
 use std::{fmt, ptr};
 use std::c_str::CString;
 use std::num::{One, Zero};
@@ -6,6 +6,16 @@ use std::num::{One, Zero};
 use ffi;
 use ssl::error::SslError;
 
+#[allow(dead_code)]
+#[repr(C)]
+pub struct BIGNUM {
+    d: *mut c_void,
+    top: c_int,
+    dmax: c_int,
+    neg: c_int,
+    flags: c_int,
+}
+
 pub struct BigNum(*mut ffi::BIGNUM);
 
 #[repr(C)]
@@ -381,9 +391,11 @@ impl Zero for BigNum {
     fn zero() -> BigNum {
         BigNum::new_from(0).unwrap()
     }
+
     fn is_zero(&self) -> bool {
         unsafe {
-            ffi::BN_is_zero(self.raw()) == 1
+            // It is raw contents of BN_is_zero macro
+            (*self.raw()).top == 0
         }
     }
 }
diff --git a/src/ffi.rs b/src/ffi.rs
index 93a252741f958089b3fa44d83f4f0ae2965b1d6a..0801577eac2f2e3a9ef7a5886f5a3df273fa6c67 100755
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -3,6 +3,8 @@
 use libc::{c_void, c_int, c_char, c_ulong, c_long, c_uint, c_uchar, size_t};
 use std::ptr;
 
+pub use bn::BIGNUM;
+
 pub type ASN1_INTEGER = c_void;
 pub type ASN1_STRING = c_void;
 pub type ASN1_TIME = c_void;
@@ -28,16 +30,6 @@ pub type X509_NAME = c_void;
 pub type X509_REQ = c_void;
 pub type X509_STORE_CTX = c_void;
 
-#[allow(dead_code)]
-#[repr(C)]
-pub struct BIGNUM {
-    d: *mut c_void,
-    top: c_int,
-    dmax: c_int,
-    pub neg: c_int,
-    flags: c_int,
-}
-
 #[repr(C)]
 pub struct EVP_MD_CTX {
     digest: *mut EVP_MD,
@@ -189,15 +181,6 @@ extern {}
 #[link(name="wsock32")]
 extern { }
 
-/* Since the openssl BN_is_zero is sometimes a macro, this wrapper is necessary. */
-pub unsafe fn BN_is_zero(a: *mut BIGNUM) -> c_int { bn_is_zero(a) }
-
-/* Special import from native/bn_is_zero.c */
-#[link(name = "wrapped", kind = "static")]
-extern "C" {
-    pub fn bn_is_zero(a: *mut BIGNUM) -> c_int;
-}
-
 // Functions converted from macros
 pub unsafe fn BIO_eof(b: *mut BIO) -> bool {
     BIO_ctrl(b, BIO_CTRL_EOF, 0, ptr::null_mut()) == 1
diff --git a/src/ssl/tests.rs b/src/ssl/tests.rs
index f98352be6e7da8c86b576fa547ee4bdbc20bc362..a68d496746caf54e394a2925002a296f85a74cfb 100644
--- a/src/ssl/tests.rs
+++ b/src/ssl/tests.rs
@@ -237,16 +237,3 @@ fn test_cert_gen() {
     // FIXME: check data in result to be correct, needs implementation
     // of X509 getters
 }
-
-#[test]
-fn test_bn_is_zero() {
-    use ffi;
-    use std::ptr;
-
-    unsafe {
-        let bn = ffi::BN_new();
-        assert!(bn != ptr::null_mut());
-        // Just make sure it is linked and resolved correctly
-        ffi::BN_is_zero(bn);
-    }
-}