diff --git a/build.rs b/build.rs
deleted file mode 100644
index 563cb21..0000000
--- a/build.rs
+++ /dev/null
@@ -1,35 +0,0 @@
-use std::env;
-use std::process::Command;
-use std::str;
-
-fn main() {
-    println!("cargo:rerun-if-changed=build.rs");
-
-    let minor = match rustc_minor_version() {
-        Some(n) => n,
-        None => return,
-    };
-
-    if minor >= 27 {
-        println!("cargo:rustc-cfg=crc32fast_stdarchx86");
-    }
-}
-
-fn rustc_minor_version() -> Option<u32> {
-    macro_rules! otry {
-        ($e:expr) => {
-            match $e {
-                Some(e) => e,
-                None => return None,
-            }
-        };
-    }
-    let rustc = otry!(env::var_os("RUSTC"));
-    let output = otry!(Command::new(rustc).arg("--version").output().ok());
-    let version = otry!(str::from_utf8(&output.stdout).ok());
-    let mut pieces = version.split('.');
-    if pieces.next() != Some("rustc 1") {
-        return None;
-    }
-    otry!(pieces.next()).parse().ok()
-}
diff --git a/src/specialized/mod.rs b/src/specialized/mod.rs
index 525a42c..18d09d0 100644
--- a/src/specialized/mod.rs
+++ b/src/specialized/mod.rs
@@ -1,6 +1,5 @@
 cfg_if! {
     if #[cfg(all(
-        crc32fast_stdarchx86,
         target_feature = "sse2",
         any(target_arch = "x86", target_arch = "x86_64")
     ))] {