2 files changed, 2 insertions, 2 deletions
diff --git a/common.mk b/common.mk
index 247a7ffb52..7c767a7b6a 100644
--- a/common.mk
+++ b/common.mk
@@ -64,7 +64,7 @@ LIBRUBY_EXTS  = ./.libruby-with-ext.time
 REVISION_H    = ./.revision.time
 PLATFORM_D    = $(TIMESTAMPDIR)/.$(PLATFORM_DIR).time
 ENC_TRANS_D   = $(TIMESTAMPDIR)/.enc-trans.time
-RDOC          = $(XRUBY) "$(tooldir)/rdoc-srcdir" $(srcdir)
+RDOC          = $(XRUBY) "$(tooldir)/rdoc-srcdir"
 RDOCOUT       = $(EXTOUT)/rdoc
 HTMLOUT       = $(EXTOUT)/html
 CAPIOUT       = doc/capi
diff --git a/tool/rdoc-srcdir b/tool/rdoc-srcdir
index a6a3c9ee24..f830fdc302 100755
--- a/tool/rdoc-srcdir
+++ b/tool/rdoc-srcdir
@@ -1,6 +1,6 @@
 #!ruby -W0
 
-rdoc_path = Dir.glob("#{ARGV[0]}/.bundle/gems/rdoc-*").first
+rdoc_path = Dir.glob("#{File.dirname(__dir__)}/.bundle/gems/rdoc-*").first
 $LOAD_PATH.unshift("#{rdoc_path}/lib")
 require 'rdoc/rdoc'