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-rw-r--r--ext/objspace/extconf.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/objspace/extconf.rb b/ext/objspace/extconf.rb
index 23a42c4c20..2b4154303f 100644
--- a/ext/objspace/extconf.rb
+++ b/ext/objspace/extconf.rb
@@ -1,2 +1,3 @@
$INCFLAGS << " -I$(topdir) -I$(top_srcdir)"
+$VPATH << '$(topdir)' << '$(top_srcdir)' # for id.h.
create_makefile('objspace')