diff --git a/app.py b/app.py
index 2f79c12..1eccdac 100644
--- a/app.py
+++ b/app.py
@@ -41,7 +41,7 @@ def mm_for_px(px, dpi=DPI):
 @lru_cache(maxsize=256)
 def make_code128_exact(
     grocycode: str,
-    xdim_px: int = 3,  # narrower bars reduce overall width; ~0.25mm at 300dpi
+    xdim_px: int = 2,  # narrower bars reduce overall width; ~0.25mm at 300dpi
     dpi: int = DPI,
 ) -> Image.Image:
     code = Code128(grocycode, writer=ImageWriter())