1 files changed, 1 insertions, 1 deletions
diff --git a/extconf.rb b/extconf.rb
index 07c59ad..1e8f37f 100644
--- a/extconf.rb
+++ b/extconf.rb
@@ -30,7 +30,7 @@ unknown: $(DLLIB)
 rdoc: docs/doc/index.html
 
 docs/doc/index.html: $(RDOC)
-\t@-(cd docs; b.rb mmap; rdoc mmap.rb)
+\t@-(cd docs; $(RUBY) b.rb mmap; rdoc mmap.rb)
 
 rd2: html