1 files changed, 2 insertions, 0 deletions

diff --git a/Make-dist b/Make-dist
index 01ef9c5b8e..f699929260 100644
--- a/Make-dist
+++ b/Make-dist
@@ -18,6 +18,8 @@
 
 dist:
 
+# Make the value empty so ifdef fails if it's $(-subdir).
+subdir := $(subdir)
 ifdef subdir
 .. := ../
 else