diff --git a/src/main.zig b/src/main.zig
index d9e0e7e..faa5228 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -811,7 +811,7 @@ fn queryParamDecoded(query: []const u8, name: []const u8, buf: []u8) ?[]const u8
                 continue;
             };
             if (out >= buf.len) return null;
-            buf[out] = (hi << 4) | lo;
+            buf[out] = (@as(u8, hi) << 4) | @as(u8, lo);
             out += 1;
             i += 3;
         } else if (raw[i] == '+') {