diff --git a/makefile b/makefile
index b67361b..f1e0b91 100644
--- a/makefile
+++ b/makefile
@@ -35,7 +35,7 @@ $(program_obj_filesobj_files): %.o: %.c
 # --------------------------
 # Unit Tests
 # --------------------------
-unitTests: numbers.o test_numbers.c $(unityfolder)/unity.c
+unitTests: numbers.o test_numbers.c bintree.o $(unityfolder)/unity.c
 	$(CC) $(FLAGS) -I$(unityfolder) -o runtest_numbers test_numbers.c numbers.o bintree.o $(unityfolder)/unity.c
 
 # --------------------------
diff --git a/numbers.o b/numbers.o
new file mode 100644
index 0000000..371b158
Binary files /dev/null and b/numbers.o differ