diff --git a/build.sh b/build.sh
index 6d945b1..8fbf280 100755
--- a/build.sh
+++ b/build.sh
@@ -17,6 +17,10 @@ build() {
     epoch=${epoch}:
   fi
 
+  if pacman -Si "${name}" | grep -v nyyu | grep -c -E '^Repository' >/dev/null; then
+    echo "WARN: Found ${name} in arch repo"
+  fi
+
   if ! compgen -G "/repo/${name}-${epoch}${ver}-${rel}-*.pkg.tar.zst" >/dev/null; then
     if makepkg -s --skippgpcheck --noconfirm --sign || makepkg -s --skippgpcheck --nocheck --noconfirm --sign; then
       for pkg in *.pkg.tar.zst; do