diff --git a/Makefile b/Makefile
index b71a8c7..832aab5 100644
--- a/Makefile
+++ b/Makefile
@@ -135,10 +135,10 @@ vpath %.c $(sort $(dir $(C_SOURCES)))
 OBJECTS += $(addprefix $(BUILD_DIR)/,$(notdir $(ASM_SOURCES:.s=.o)))
 vpath %.s $(sort $(dir $(ASM_SOURCES)))
 
-$(BUILD_DIR)/%.o: %.c Makefile | $(BUILD_DIR)
+$(BUILD_DIR)/%.o: %.c Inc/config.h Makefile | $(BUILD_DIR)
 	$(CC) -c $(CFLAGS) -Wa,-a,-ad,-alms=$(BUILD_DIR)/$(notdir $(<:.c=.lst)) $< -o $@
 
-$(BUILD_DIR)/%.o: %.s Makefile | $(BUILD_DIR)
+$(BUILD_DIR)/%.o: %.s Inc/config.h Makefile | $(BUILD_DIR)
 	$(AS) -c $(CFLAGS) $< -o $@
 
 $(BUILD_DIR)/$(TARGET).elf: $(OBJECTS) Makefile
@@ -152,7 +152,7 @@ $(BUILD_DIR)/%.bin: $(BUILD_DIR)/%.elf | $(BUILD_DIR)
 	$(BIN) $< $@
 
 $(BUILD_DIR):
-	mkdir $@
+	mkdir -p $@
 
 format:
 	find Src/ Inc/ -iname '*.h' -o -iname '*.c' | xargs clang-format -i