diff --git a/Makefile b/Makefile
index 3777cea..5fc3a7a 100644
--- a/Makefile
+++ b/Makefile
@@ -25,9 +25,10 @@ BUILD_DIR = build
 SRC_FILES := $(wildcard $(SRC_DIR)/*.c)
 PREP_FILES := $(patsubst $(SRC_DIR)/%.c,$(BUILD_DIR)/%.i,$(SRC_FILES))
 ASM_FILES := $(patsubst $(BUILD_DIR)/%.i,$(BUILD_DIR)/%.S,$(PREP_FILES))
+OBJ_FILES := $(patsubst $(BUILD_DIR)/%.S,$(BUILD_DIR)/%.o,$(ASM_FILES))
 
 .PHONY: build
-build: builddir preprocess compile
+build: builddir preprocess compile assemble
 
 $(BUILD_DIR)/%.i: $(SRC_DIR)/%.c
 	$(CC) $(CFLAGS) -E $^ -o $@
@@ -35,6 +36,9 @@ $(BUILD_DIR)/%.i: $(SRC_DIR)/%.c
 $(BUILD_DIR)/%.S: $(BUILD_DIR)/%.i
 	$(CC) $(CFLAGS) -S $^ -o $@
 
+$(BUILD_DIR)/%.o: $(BUILD_DIR)/%.S
+	$(CC) $(CFLAGS) -c $^ -o $@
+
 .PHONY: builddir
 builddir:
 	mkdir $(BUILD_DIR)
@@ -45,6 +49,9 @@ preprocess: $(PREP_FILES)
 .PHONY: compile
 compile: preprocess $(ASM_FILES)
 
+.PHONY: assemble
+assemble: compile $(OBJ_FILES)
+
 .PHONY: clean
 clean:
 	rm -rf $(BUILD_DIR)
diff --git a/build/main.o b/build/main.o
new file mode 100644
index 0000000..9bc5058
Binary files /dev/null and b/build/main.o differ