diff --git a/build.sc b/build.mill
similarity index 99%
rename from build.sc
rename to build.mill
index 811d015c4c..e8751b9527 100644
--- a/build.sc
+++ b/build.mill
@@ -1,3 +1,5 @@
+package build
+
 import $ivy.`com.lihaoyi::mill-contrib-bloop:$MILL_VERSION`
 import $ivy.`io.get-coursier::coursier-launcher:2.1.13`
 import $ivy.`io.github.alexarchambault.mill::mill-native-image-upload:0.1.26`
diff --git a/project/deps.sc b/project/deps.mill
similarity index 99%
rename from project/deps.sc
rename to project/deps.mill
index 67f97f17ca..82614f65ee 100644
--- a/project/deps.sc
+++ b/project/deps.mill
@@ -1,3 +1,5 @@
+package build.project
+
 import Deps.Versions
 import mill._
 import scalalib._
diff --git a/project/package.mill b/project/package.mill
new file mode 100644
index 0000000000..5aa711479c
--- /dev/null
+++ b/project/package.mill
@@ -0,0 +1 @@
+package build.project
diff --git a/project/publish.sc b/project/publish.mill
similarity index 98%
rename from project/publish.sc
rename to project/publish.mill
index 4a305fe2a5..3c147137cb 100644
--- a/project/publish.sc
+++ b/project/publish.mill
@@ -1,6 +1,8 @@
+package build.project
+
 import $ivy.`de.tototec::de.tobiasroeser.mill.vcs.version::0.4.0`
 import $ivy.`org.eclipse.jgit:org.eclipse.jgit:6.8.0.202311291450-r`
-import $file.settings, settings.{PublishLocalNoFluff, workspaceDirName}
+import $file.project.settings, settings.{PublishLocalNoFluff, workspaceDirName}
 
 import de.tobiasroeser.mill.vcs.version._
 import mill._, scalalib._
diff --git a/project/settings.sc b/project/settings.mill
similarity index 99%
rename from project/settings.sc
rename to project/settings.mill
index b28ed46f4d..56ce920a2e 100644
--- a/project/settings.sc
+++ b/project/settings.mill
@@ -1,9 +1,11 @@
+package build.project
+
 import $ivy.`com.goyeau::mill-scalafix::0.3.1`
 import $ivy.`io.github.alexarchambault.mill::mill-native-image::0.1.26`
 
-import $file.deps,
+import $file.project.deps,
   deps.{Deps, Docker, alpineVersion, buildCsVersion, buildCsM1Version, libsodiumVersion}
-import $file.utils, utils.isArmArchitecture
+import $file.project.utils, utils.isArmArchitecture
 
 import com.goyeau.mill.scalafix.ScalafixModule
 import de.tobiasroeser.mill.vcs.version.VcsVersion
diff --git a/project/utils.sc b/project/utils.mill
similarity index 85%
rename from project/utils.sc
rename to project/utils.mill
index bedd500dda..ab6beaca16 100644
--- a/project/utils.sc
+++ b/project/utils.mill
@@ -1,3 +1,5 @@
+package build.project
+
 import java.util.Locale
 
 lazy val isArmArchitecture: Boolean =
diff --git a/project/website.sc b/project/website.mill
similarity index 95%
rename from project/website.sc
rename to project/website.mill
index 9bffdec43b..5cbf883fa1 100644
--- a/project/website.sc
+++ b/project/website.mill
@@ -1,4 +1,6 @@
-import $file.deps, deps.Scala
+package build.project
+
+import $file.project.deps, deps.Scala
 
 private def lastTableLine(path: os.Path, colCount: Int): Seq[String] = {
   val content = os.read(path)