diff --git a/common.mk b/common.mk
index 49d38149f5..d690873dea 100644
--- a/common.mk
+++ b/common.mk
@@ -376,7 +376,7 @@ $(ruby_pc): $(srcdir)/template/ruby.pc.in config.status
 install-all: docs pre-install-all do-install-all post-install-all
 pre-install-all:: all pre-install-local pre-install-ext pre-install-gem pre-install-doc
 do-install-all: pre-install-all
-	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) $(INSTALL_DOC_OPTS)
+	$(INSTRUBY) --make="$(MAKE)" $(INSTRUBY_ARGS) --install=all $(INSTALL_DOC_OPTS)
 post-install-all:: post-install-local post-install-ext post-install-gem post-install-doc
 	@$(NULLCMD)