diff --git a/commitpkg.in b/commitpkg.in
index 08f2b97..d55ce37 100644
--- a/commitpkg.in
+++ b/commitpkg.in
@@ -83,7 +83,7 @@ while getopts ':l:a:s:f' flag; do
 done
 shift $(( OPTIND - 1 ))
 
-# check packages have the packager field set
+# check packages for validity
 for _arch in "${arch[@]}"; do
 	if [[ -n $commit_arch && ${_arch} != "$commit_arch" ]]; then
 		continue
@@ -95,6 +95,11 @@ for _arch in "${arch[@]}"; do
 			if grep -q "packager = Unknown Packager" <(bsdtar -xOqf "$pkgfile" .PKGINFO); then
 				die "PACKAGER was not set when building package"
 			fi
+			hashsum=sha256sum
+			pkgbuild_hash=$(awk -v"hashsum=$hashsum" -F' = ' '$1 == "pkgbuild_"hashsum {print $2}' <(bsdtar -xOqf "$pkgfile" .BUILDINFO))
+			if [[ "$pkgbuild_hash" != "$($hashsum PKGBUILD|cut -d' ' -f1)" ]]; then
+				die "PKGBUILD $hashsum mismatch: expected $pkgbuild_hash"
+			fi
 		fi
 	done
 done