1 files changed, 1 insertions, 1 deletions
diff --git a/common.mk b/common.mk
index 3987805fc2..7544f96f7e 100644
--- a/common.mk
+++ b/common.mk
@@ -387,7 +387,7 @@ post-install-doc::
 
 rdoc: PHONY main
 	@echo Generating RDoc documentation
-	$(Q) $(XRUBY) "$(srcdir)/bin/rdoc" --no-force-update --all --ri --op "$(RDOCOUT)" $(RDOCFLAGS) "$(srcdir)"
+	$(Q) $(XRUBY) "$(srcdir)/bin/rdoc" --encoding=UTF-8 --no-force-update --all --ri --op "$(RDOCOUT)" $(RDOCFLAGS) "$(srcdir)"
 nodoc: PHONY
 
 what-where-doc: no-install-doc