diff --git a/sbt-app/src/sbt-test/dependency-management/i9243-custom-platform-local-compiler-plugin/build.sbt b/sbt-app/src/sbt-test/dependency-management/i9243-custom-platform-local-compiler-plugin/build.sbt
new file mode 100644
index 000000000..3eda44eb2
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/i9243-custom-platform-local-compiler-plugin/build.sbt
@@ -0,0 +1,13 @@
+lazy val compilerPlugin = project
+  .in(file("scala-compiler-plugin"))
+  .settings(
+    platform := Platform.jvm,
+    crossVersion := CrossVersion.full,
+  )
+
+lazy val platformLib = project
+  .in(file("platform-lib"))
+  .dependsOn(compilerPlugin % "plugin")
+  .settings(
+    platform := "custom",
+  )
diff --git a/sbt-app/src/sbt-test/dependency-management/i9243-custom-platform-local-compiler-plugin/test b/sbt-app/src/sbt-test/dependency-management/i9243-custom-platform-local-compiler-plugin/test
new file mode 100644
index 000000000..103bd8d2f
--- /dev/null
+++ b/sbt-app/src/sbt-test/dependency-management/i9243-custom-platform-local-compiler-plugin/test
@@ -0,0 +1 @@
+> update