diff --git a/testing/Makefile b/testing/Makefile
index 65fd8294..fffb10d9 100644
--- a/testing/Makefile
+++ b/testing/Makefile
@@ -1,11 +1,10 @@
 COMMON_LIB_DIR?=${PWD}/lib
 TEST_DIRS=$(shell dirname $(wildcard */Makefile))
 
-DIRS=googletest hello-simulator kaleidoscope common
+DIRS=googletest hello-simulator kaleidoscope common issue_840
 CLEANDIRS = $(DIRS:%=clean-%)
 
 .PHONY: subdirs $(CLEANDIRS)
-.PHONY: subdirs $(DIRS)
 
 clean: googletest/Makefile $(CLEANDIRS)
 	rm -rf "$(COMMON_LIB_DIR)"
@@ -28,6 +27,9 @@ common:
 hello-simulator:
 	@:
 
+Makefile:
+	@:
+
 %: common googletest 
 	cd "$@" && $(MAKE)