diff --git a/Makefile b/Makefile
index ff9953f..8853883 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,10 @@ TARGET := cval.out
 
 .PHONY: all clean
 
-all: $(TARGET)
+all: init $(TARGET)
+
+init:
+	mkdir -p $(BUILD_DIR)
 
 $(TARGET): $(OBJ)
 	$(CC) $(CFLAGS) -o $(BUILD_DIR)/$(TARGET) $(OBJ)