diff --git a/nix/templates/harness-base.nix b/nix/templates/harness-base.nix
index b5f2175..b1ad1dd 100644
--- a/nix/templates/harness-base.nix
+++ b/nix/templates/harness-base.nix
@@ -454,7 +454,7 @@
         TOKEN=$(cat "$TOKEN_FILE")
         # Rasterize SVG → PNG (Forgejo's Go image library can't decode SVG).
         PNG=$(mktemp --suffix=.png)
-        if ! rsvg-convert -f png -w 256 -h 256 "$ICON" -o "$PNG" 2>/dev/null; then
+        if ! rsvg-convert -f png -w 512 -h 512 "$ICON" -o "$PNG" 2>/dev/null; then
           echo "forge-avatar-sync: rsvg-convert failed; skipping"
           rm -f "$PNG"
           exit 0