--- a/tests/Makefile	Thu Dec 28 20:37:53 2023 +0100
+++ b/tests/Makefile	Fri Dec 29 16:15:05 2023 +0100
@@ -59,7 +59,9 @@
 	@echo "Compiling $<"
 	$(CC) -o $@ $(CFLAGS) -c $<
 
-$(TEST_DIR)/test_string$(OBJ_EXT): test_string.c
+$(TEST_DIR)/test_string$(OBJ_EXT): test_string.c ../src/cx/test.h \
+ util_allocator.h ../src/cx/allocator.h ../src/cx/common.h \
+ ../src/cx/string.h ../src/cx/allocator.h
 	@echo "Compiling $<"
 	$(CC) -o $@ $(CFLAGS) -c $<