diff --git a/Makefile b/Makefile
index db2e227..29c1788 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ TEST_SRC := $(shell find tests -name '*.s')
 # Replace .s with .elf
 TESTS := $(patsubst %.s,%.elf,$(TEST_SRC))
 
-all: calc.elf
+all: calc.elf tests
 
 check: tests
 	@tests/unittest