diff --git a/support/update-rundk.sh b/support/update-rundk.sh
index cfda3b9..872a6a7 100755
--- a/support/update-rundk.sh
+++ b/support/update-rundk.sh
@@ -67,8 +67,8 @@ if [ -n "$projdir" ]; then
         cp "$MYDIR/build" "$rundir/build"
         chmod +x "$rundir/build"
     fi
-    if [ ! -f "$projdir/.build.env.dist" ]; then
-        sed <"$MYDIR/dot-build.env.dist" >"$projdir/.build.env.dist" '
+    if [ ! -f "$projdir/..env.dist" ]; then
+        sed <"$MYDIR/dot-build.env.dist" >"$projdir/..env.dist" '
 /^IMAGENAME=/s/=.*\//='"$(basename -- "$projdir")"'\//
 '
         initial_config=1