1 files changed, 2 insertions, 1 deletions
diff --git a/src/string_immutable.zig b/src/string_immutable.zig
index 0e98f3f5f..d075b38f5 100644
--- a/src/string_immutable.zig
+++ b/src/string_immutable.zig
@@ -1484,7 +1484,8 @@ pub fn convertUTF16ToUTF8(list_: std.ArrayList(u8), comptime Type: type, utf16:
 pub fn toUTF8AllocWithType(allocator: std.mem.Allocator, comptime Type: type, utf16: Type) ![]u8 {
     if (bun.FeatureFlags.use_simdutf and comptime Type == []const u16) {
         const length = bun.simdutf.length.utf8.from.utf16.le(utf16);
-        var list = try std.ArrayList(u8).initCapacity(allocator, length);
+        // add 4 bytes of padding for SIMDUTF
+        var list = try std.ArrayList(u8).initCapacity(allocator, length + 4);
         list = try convertUTF16ToUTF8(list, Type, utf16);
         return list.items;
     }