diff --git a/lib/std/crypto/blake2.zig b/lib/std/crypto/blake2.zig
index a4ab64bda5294bd96bd130200e0f1adb3b3f556a..ab44ca5298633205ead0cd54f3da3c1cea383d90 100644
--- a/lib/std/crypto/blake2.zig
+++ b/lib/std/crypto/blake2.zig
@@ -419,7 +419,7 @@ pub fn Blake2b(comptime out_len: usize) type {
             mem.copy(u64, d.h[0..], iv[0..]);
 
             // default parameters
-            d.h[0] ^= 0x01010000 ^ @truncate(u32, d.key.len << 8) ^ @intCast(u32, out_len >> 3);
+            d.h[0] ^= 0x01010000 ^ (d.key.len << 8) ^ (out_len >> 3);
             d.t = 0;
             d.buf_len = 0;