diff --git a/makefile b/makefile
index c4c6314..cb05ca2 100644
--- a/makefile
+++ b/makefile
@@ -1,5 +1,5 @@
 CC = gcc
-FLAGS = -g -Wall -lm
+CFLAGS = -g -Wall -lm
 
 ifeq ($(OS),Windows_NT)
 	include makefile_windows.variables
@@ -27,10 +27,10 @@ doble_initial:
 program_obj_files = stack.o bintree.o numbers.o timer.o highscore.o
 
 doble : main.o $(program_obj_files)
-	$(CC) $(FLAGS) $^ -o doble
+	$(CC) $(CFLAGS) $^ -o doble
 
-$(program_obj_filesobj_files): %.o: %.c
-	$(CC) -c $(FLAGS) $^ -o $@
+$(program_obj_files): %.o: %.c
+	$(CC) -c $(CFLAGS) $^ -o $@
 
 # --------------------------
 # Unit Tests
@@ -39,11 +39,11 @@ TEST_STACK_SOURCES = stack.c test_stack.c $(unityfolder)/unity.c
 TEST_BINTREE_SOURCES = bintree.c test_bintree.c stack.c $(unityfolder)/unity.c
 
 stackTests: $(TEST_STACK_SOURCES) stack.h
-	$(CC) $(FLAGS) -I$(unityfolder) $(TEST_STACK_SOURCES) -o runStackTests
+	$(CC) $(CFLAGS) -I$(unityfolder) $(TEST_STACK_SOURCES) -o runStackTests
 	./runStackTests
 
 bintreeTests: $(TEST_BINTREE_SOURCES) stack.h bintree.h
-	$(CC) $(FLAGS) -I$(unityfolder) $(TEST_BINTREE_SOURCES) -o runBintreeTests
+	$(CC) $(CFLAGS) -I$(unityfolder) $(TEST_BINTREE_SOURCES) -o runBintreeTests
 	./runBintreeTests
 
 # --------------------------