diff --git a/secp256k1-sys/src/types.rs b/secp256k1-sys/src/types.rs
index e2b9030..71467e8 100644
--- a/secp256k1-sys/src/types.rs
+++ b/secp256k1-sys/src/types.rs
@@ -1,5 +1,4 @@
 #![allow(non_camel_case_types)]
-use core::fmt;
 
 pub type c_int = i32;
 pub type c_uchar = u8;
@@ -10,23 +9,7 @@ pub type size_t = usize;
 /// The way we use it makes it fine either way but this type shouldn't be used outside of the library.
 pub type c_char = i8;
 
-/// This is an exact copy of <https://doc.rust-lang.org/core/ffi/enum.c_void.html>
-/// It should be Equivalent to C's void type when used as a pointer.
-///
-/// We can replace this with `core::ffi::c_void` once we update the rustc version to >=1.30.0.
-#[repr(u8)]
-pub enum c_void {
-    #[doc(hidden)]
-    __variant1,
-    #[doc(hidden)]
-    __variant2,
-}
-
-impl fmt::Debug for c_void {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.pad("c_void")
-    }
-}
+pub use core::ffi::c_void;
 
 /// A type that is as aligned as the biggest alignment for fundamental types in C
 /// since C11 that means as aligned as `max_align_t` is.
@@ -46,7 +29,7 @@ impl AlignedType {
 }
 
 #[cfg(all(feature = "std", not(rust_secp_no_symbol_renaming)))]
-pub(crate) const ALIGN_TO: usize = ::core::mem::align_of::<AlignedType>();
+pub(crate) const ALIGN_TO: usize = core::mem::align_of::<AlignedType>();
 
 #[cfg(test)]
 mod tests {