diff --git a/doc/makepkg.8.asciidoc b/doc/makepkg.8.asciidoc
index cf819b9c..5ba13ace 100644
--- a/doc/makepkg.8.asciidoc
+++ b/doc/makepkg.8.asciidoc
@@ -363,6 +363,10 @@ On exit, makepkg will return one of the following error codes.
 16::
 	Specified GPG key does not exist or failed to sign package.
 
+17::
+	The local repository is not a clone of the source repository
+	specified in PKGBUILD.
+
 See Also
 --------
 linkman:makepkg.conf[5], linkman:PKGBUILD[5], linkman:pacman[8]
diff --git a/scripts/libmakepkg/source/fossil.sh.in b/scripts/libmakepkg/source/fossil.sh.in
index 4ffc4a3d..bf2fa53e 100644
--- a/scripts/libmakepkg/source/fossil.sh.in
+++ b/scripts/libmakepkg/source/fossil.sh.in
@@ -24,6 +24,7 @@ LIBMAKEPKG_SOURCE_FOSSIL_SH=1
 
 MAKEPKG_LIBRARY=${MAKEPKG_LIBRARY:-'@libmakepkgdir@'}
 
+source "$MAKEPKG_LIBRARY/util/error.sh"
 source "$MAKEPKG_LIBRARY/util/message.sh"
 source "$MAKEPKG_LIBRARY/util/pkgbuild.sh"
 
@@ -57,7 +58,7 @@ download_fossil() {
 		if ! [[ $(fossil remote -R "$db") = "$url" ]]; then
 			error "$(gettext "%s is not a clone of %s")" "$db" "$url"
 			plainerr "$(gettext "Aborting...")"
-			exit 1
+			exit $E_NOT_A_CLONE_OF
 		fi
 		msg2 "$(gettext "Updating %s %s repo...")" "${repo}" "fossil"
 		if ! fossil pull -R "$db"; then
diff --git a/scripts/libmakepkg/source/git.sh.in b/scripts/libmakepkg/source/git.sh.in
index 0f835c3c..e8051760 100644
--- a/scripts/libmakepkg/source/git.sh.in
+++ b/scripts/libmakepkg/source/git.sh.in
@@ -24,6 +24,7 @@ LIBMAKEPKG_SOURCE_GIT_SH=1
 
 MAKEPKG_LIBRARY=${MAKEPKG_LIBRARY:-'@libmakepkgdir@'}
 
+source "$MAKEPKG_LIBRARY/util/error.sh"
 source "$MAKEPKG_LIBRARY/util/message.sh"
 source "$MAKEPKG_LIBRARY/util/pkgbuild.sh"
 
@@ -60,7 +61,7 @@ download_git() {
 		if [[ "${url%%.git}" != "${remote_url%%.git}" ]] ; then
 			error "$(gettext "%s is not a clone of %s")" "$dir" "$url"
 			plainerr "$(gettext "Aborting...")"
-			exit 1
+			exit $E_NOT_A_CLONE_OF
 		fi
 		msg2 "$(gettext "Updating %s %s repo...")" "${repo}" "git"
 		if ! git fetch --all -p; then
diff --git a/scripts/libmakepkg/util/error.sh.in b/scripts/libmakepkg/util/error.sh.in
index 88f87be1..b3def432 100644
--- a/scripts/libmakepkg/util/error.sh.in
+++ b/scripts/libmakepkg/util/error.sh.in
@@ -39,3 +39,4 @@ E_ALREADY_BUILT=13
 E_INSTALL_FAILED=14
 E_MISSING_MAKEPKG_DEPS=15
 E_PRETTY_BAD_PRIVACY=16
+E_NOT_A_CLONE_OF=17