diff --git a/makefile b/makefile
index aa5e933..7cff821 100644
--- a/makefile
+++ b/makefile
@@ -275,6 +275,8 @@ endef
 
 $(foreach demo, $(strip $(DEMOS)), $(eval $(call DEMO_template,$(demo))))
 
+bins: $(USEFUL_DEMOS)
+
 all_test: test tv_gen $(DEMOS)
 ifeq ($(COVERAGE),1)
 all_test: LIB_PRE = -Wl,--whole-archive
diff --git a/makefile.include b/makefile.include
index e426156..5dadaba 100644
--- a/makefile.include
+++ b/makefile.include
@@ -87,7 +87,8 @@ endif
 TIMING=timing
 TEST=test
 
-DEMOS=hashsum ltcrypt small tv_gen sizes constants
+USEFUL_DEMOS=hashsum
+DEMOS=$(USEFUL_DEMOS) ltcrypt small tv_gen sizes constants
 
 TIMINGS=demos/timing.o
 TESTS=demos/test.o