diff --git a/std/crypto/x25519.zig b/std/crypto/x25519.zig
index 16ec09f66e..9a9df30962 100644
--- a/std/crypto/x25519.zig
+++ b/std/crypto/x25519.zig
@@ -114,7 +114,7 @@ pub const X25519 = struct {
         return !zerocmp(u8, out);
     }
 
-    pub fn createPublicKey(public_key: []const u8, private_key: []const u8) bool {
+    pub fn createPublicKey(public_key: [] u8, private_key: []const u8) bool {
         var base_point = []u8{9} ++ []u8{0} ** 31;
         return create(public_key, private_key, base_point);
     }