diff --git a/liteeth/core/arp.py b/liteeth/core/arp/__init__.py
similarity index 100%
rename from liteeth/core/arp.py
rename to liteeth/core/arp/__init__.py
diff --git a/liteeth/core/ip.py b/liteeth/core/ip/__init__.py
similarity index 100%
rename from liteeth/core/ip.py
rename to liteeth/core/ip/__init__.py
diff --git a/liteeth/core/udp.py b/liteeth/core/udp/__init__.py
similarity index 100%
rename from liteeth/core/udp.py
rename to liteeth/core/udp/__init__.py