diff --git a/openssl/src/base64.rs b/openssl/src/base64.rs
index 42708c42..81a13265 100644
--- a/openssl/src/base64.rs
+++ b/openssl/src/base64.rs
@@ -3,10 +3,10 @@
 //! See manual page of [`EVP_EncodeInit`] for more information on the specific base64 variant.
 //!
 //! [`EVP_EncodeInit`]: https://www.openssl.org/docs/man1.1.1/man3/EVP_EncodeInit.html
+use cvt_n;
 use error::ErrorStack;
 use ffi;
 use libc::c_int;
-use cvt_n;
 
 /// Encodes a given block of bytes to base64.
 ///
@@ -19,8 +19,7 @@ pub fn encode_block(src: &[u8]) -> String {
     let src_len = src.len() as c_int;
 
     let len = encoded_len(src_len).unwrap();
-    let mut out = Vec::new();
-    out.reserve(len as usize);
+    let mut out = Vec::with_capacity(len as usize);
 
     // SAFETY: `encoded_len` ensures space for 4 output characters
     // for every 3 input bytes including padding and nul terminator.
@@ -46,8 +45,7 @@ pub fn decode_block(src: &str) -> Result<Vec<u8>, ErrorStack> {
     let src_len = src.len() as c_int;
 
     let len = decoded_len(src_len).unwrap();
-    let mut out = Vec::new();
-    out.reserve(len as usize);
+    let mut out = Vec::with_capacity(len as usize);
 
     // SAFETY: `decoded_len` ensures space for 3 output bytes
     // for every 4 input characters including padding.
@@ -55,7 +53,11 @@ pub fn decode_block(src: &str) -> Result<Vec<u8>, ErrorStack> {
     // leading and trailing whitespace, but never more.
     // `EVP_DecodeBlock` will only write to not read from `out`.
     unsafe {
-        let out_len = cvt_n(ffi::EVP_DecodeBlock(out.as_mut_ptr(), src.as_ptr(), src_len))?;
+        let out_len = cvt_n(ffi::EVP_DecodeBlock(
+            out.as_mut_ptr(),
+            src.as_ptr(),
+            src_len,
+        ))?;
         out.set_len(out_len as usize);
     }