diff --git a/main/src/main/scala/sbt/internal/FileChangesMacro.scala b/main/src/main/scala/sbt/internal/FileChangesMacro.scala
index d78bb88ef..29d0b8ce0 100644
--- a/main/src/main/scala/sbt/internal/FileChangesMacro.scala
+++ b/main/src/main/scala/sbt/internal/FileChangesMacro.scala
@@ -98,8 +98,5 @@ object FileChangesMacro:
     '{ rescope[Seq[NioPath]]($ts, allOutputFiles).value }
 
   private def getTaskScope[A: Type](in: Expr[TaskKey[A]])(using Quotes): Expr[sbt.Scope] =
-    '{
-      if $in.scope.task.toOption.isDefined then $in.scope
-      else $in.scope.copy(task = Select($in.key))
-    }
+    '{ $in.scope.copy(task = Select($in.key)) }
 end FileChangesMacro
diff --git a/sbt-app/src/sbt-test/nio/nested-task-scope/build.sbt b/sbt-app/src/sbt-test/nio/nested-task-scope/build.sbt
new file mode 100644
index 000000000..0a0fbaa9f
--- /dev/null
+++ b/sbt-app/src/sbt-test/nio/nested-task-scope/build.sbt
@@ -0,0 +1,20 @@
+import sbt.nio.Keys._
+import sbt.internal.FileChangesMacro._
+
+val testTask = taskKey[Unit]("test task")
+val otherTask = taskKey[Unit]("dummy task")
+
+// Set fileInputs at nested task scope: otherTask / testTask
+otherTask / testTask / fileInputs := Seq(
+  baseDirectory.value.toGlob / "src" / "*.txt"
+)
+
+// Create a scoped task key to use with the inputFileChanges macro
+val scopedTestTask = otherTask / testTask
+
+// Test that inputFileChanges works with nested task scopes (fixes #7489)
+val checkChanges = taskKey[Unit]("check that file changes are detected")
+checkChanges := {
+  val files = scopedTestTask.inputFiles
+  assert(files.nonEmpty, s"inputFiles should not be empty, got: $files")
+}
diff --git a/sbt-app/src/sbt-test/nio/nested-task-scope/src/test.txt b/sbt-app/src/sbt-test/nio/nested-task-scope/src/test.txt
new file mode 100644
index 000000000..f2376e2ba
--- /dev/null
+++ b/sbt-app/src/sbt-test/nio/nested-task-scope/src/test.txt
@@ -0,0 +1 @@
+initial content
diff --git a/sbt-app/src/sbt-test/nio/nested-task-scope/test b/sbt-app/src/sbt-test/nio/nested-task-scope/test
new file mode 100644
index 000000000..5c92ac474
--- /dev/null
+++ b/sbt-app/src/sbt-test/nio/nested-task-scope/test
@@ -0,0 +1,3 @@
+# Test that inputFileChanges works with nested task scopes (fixes #7489)
+
+> checkChanges