diff --git a/pyproject.toml b/pyproject.toml
index 63ba0d8b916c513f12a818aa0d7a37a54ad7617e..529bd20bb173163ce8d66e8dbb0150781050cbac 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,5 +8,5 @@ version = "0.1"
 
 [tool.setuptools]
 ext-modules = [
-  {name = "zlib_into", sources = ["zlib_into.c"], libraries = ["z"], py-limited-api=true}
+  {name = "zlib_into", sources = ["src/zlib_into.c"], libraries = ["z"], py-limited-api=true}
 ]
diff --git a/zlib_into.c b/src/zlib_into.c
similarity index 100%
rename from zlib_into.c
rename to src/zlib_into.c