diff --git a/lib/std/crypto.zig b/lib/std/crypto.zig
index 7833a31237bff443a652bc9c4ca639c81e90e98f..d020d61e14c9c3d27712ed05bacf03d16ca1c5b6 100644
--- a/lib/std/crypto.zig
+++ b/lib/std/crypto.zig
@@ -412,7 +412,7 @@ test "issue #4532: no index out of bounds" {
 /// Sets a slice to zeroes.
 /// Prevents the store from being optimized out.
 pub fn secureZero(comptime T: type, s: []volatile T) void {
-    @memset(s, 0);
+    @memset(s, std.mem.zeroes(T));
 }
 
 test secureZero {
diff --git a/lib/std/crypto/ghash_polyval.zig b/lib/std/crypto/ghash_polyval.zig
index 45b2beb91b253ae0ee7fb6a8151bf82c0df47817..8e33eb80750c0b6c43e3f0106ff45636ef22670e 100644
--- a/lib/std/crypto/ghash_polyval.zig
+++ b/lib/std/crypto/ghash_polyval.zig
@@ -402,7 +402,7 @@ fn Hash(comptime endian: std.builtin.Endian, comptime shift_key: bool) type {
             st.pad();
             mem.writeInt(u128, out[0..16], st.acc, endian);
 
-            std.crypto.secureZero(u8, @as([*]u8, @ptrCast(st))[0..@sizeOf(Self)]);
+            std.crypto.secureZero(Self, st[0..1]);
         }
 
         /// Compute the GHASH of a message.
diff --git a/lib/std/crypto/poly1305.zig b/lib/std/crypto/poly1305.zig
index 5bf5a57428897f54595c785eeb4b1bd6acdbb30d..3d6e4d89c33b785dfbeda0fc2fd03a12cf88be2b 100644
--- a/lib/std/crypto/poly1305.zig
+++ b/lib/std/crypto/poly1305.zig
@@ -184,7 +184,7 @@ pub const Poly1305 = struct {
         mem.writeInt(u64, out[0..8], st.h[0], .little);
         mem.writeInt(u64, out[8..16], st.h[1], .little);
 
-        std.crypto.secureZero(u8, @as([*]u8, @ptrCast(st))[0..@sizeOf(Poly1305)]);
+        std.crypto.secureZero(Poly1305, st[0..1]);
     }
 
     pub fn create(out: *[mac_length]u8, msg: []const u8, key: *const [key_length]u8) void {