diff --git a/Makefile b/Makefile
index 194cc54..5388bc0 100644
--- a/Makefile
+++ b/Makefile
@@ -27,6 +27,7 @@ EMU_OBJ_LICENSE ?= $(BUILD_DIR)/license
 EMU_OBJ_LICENSE_IF_EXISTS := $(wildcard $(EMU_OBJ_LICENSE))
 
 README_FILE ?= $(BUILD_DIR)/README.txt
+DOCKERFILE ?= $(BUILD_DIR)/Dockerfile
 ZIP_FILE ?= $(BUILD_DIR)/challenge.zip
 ZIP_FILE_IF_EXISTS := $(wildcard $(ZIP_FILE))
 
@@ -98,9 +99,12 @@ endif
 $(EMU_OBJ): $(EMU_OBJ_FILES) | $(BUILD_DIR)
 	$(RISCV_CC) $(RISCV_ARCH_FLAGS) -nostdlib -Wl,-e,entry -Wl,-Ttext=0 -Wl,--emit-relocs $(EMU_OBJ_FILES) -o $@
 
+# Copy Dockerfile into build dir
+$(DOCKERFILE): Dockerfile | $(BUILD_DIR)
+	cp $< $@
 
 # Bundle the challenge
-$(ZIP_FILE): $(HOST_EXE) $(EMU_OBJ_LICENSE) $(README_FILE) | $(BUILD_DIR)
+$(ZIP_FILE): $(HOST_EXE) $(EMU_OBJ_LICENSE) $(README_FILE) $(DOCKERFILE) | $(BUILD_DIR)
 ifneq ($(ZIP_FILE_IF_EXISTS),)
 	rm $(ZIP_FILE_IF_EXISTS)
 endif
@@ -121,4 +125,3 @@ clean:
 
 disas-risc: $(_DISAS_FILES)
 	$(RISCV_OBJDUMP) -d $^
-