diff --git a/config.mk.in b/config.mk.in
index 7eed050ca..9973b7eaa 100644
--- a/config.mk.in
+++ b/config.mk.in
@@ -8,7 +8,8 @@
 # first target encountered).
 
 NAME=@PACKAGE_NAME@
-PACKAGE_TARNAME=@PACKAGE_TARNAME@
+TARNAME=@PACKAGE_TARNAME@
+PACKAGE_TARNAME=@PACKAGE_TARNAME@ # needed by docdir
 VERSION=@PACKAGE_VERSION@
 
 prefix=@prefix@
diff --git a/config.sh.in b/config.sh.in
index 155f2158e..0a91c68f2 100644
--- a/config.sh.in
+++ b/config.sh.in
@@ -4,4 +4,5 @@
 # shellcheck disable=SC2034
 
 NAME="@PACKAGE_NAME@"
+TARNAME="@PACKAGE_TARNAME@"
 VERSION="@PACKAGE_VERSION@"