diff --git a/compiler/src/dotty/tools/dotc/sbt/package.scala b/compiler/src/dotty/tools/dotc/sbt/package.scala
index 379a2e45ce40..7c24319005ed 100644
--- a/compiler/src/dotty/tools/dotc/sbt/package.scala
+++ b/compiler/src/dotty/tools/dotc/sbt/package.scala
@@ -12,7 +12,7 @@ inline val InlineParamHash = 1997 // 302nd prime
 extension (sym: Symbol)
 
   def constructorName(using Context) =
-    sym.owner.fullName ++ ";init;"
+    sym.owner.name ++ ";init;"
 
   /** Mangle a JVM symbol name in a format better suited for internal uses by sbt. */
   def zincMangledName(using Context): Name =
diff --git a/sbt-test/source-dependencies/constructors/A.scala b/sbt-test/source-dependencies/constructors/A.scala
index b81025bada4d..0c5a5efa5b25 100644
--- a/sbt-test/source-dependencies/constructors/A.scala
+++ b/sbt-test/source-dependencies/constructors/A.scala
@@ -1 +1,3 @@
+package example
+
 class A(a: Int)
diff --git a/sbt-test/source-dependencies/constructors/B.scala b/sbt-test/source-dependencies/constructors/B.scala
index e44b1d4c7852..b66f04320f13 100644
--- a/sbt-test/source-dependencies/constructors/B.scala
+++ b/sbt-test/source-dependencies/constructors/B.scala
@@ -1 +1,3 @@
+package example
+
 class B { val y = new A(2) }
diff --git a/sbt-test/source-dependencies/constructors/changes/A2.scala b/sbt-test/source-dependencies/constructors/changes/A2.scala
index edd9e160e7bf..5f72892e6f26 100644
--- a/sbt-test/source-dependencies/constructors/changes/A2.scala
+++ b/sbt-test/source-dependencies/constructors/changes/A2.scala
@@ -1 +1,3 @@
+package example
+
 class A(a: String)
diff --git a/sbt-test/source-dependencies/constructors/changes/B2.scala b/sbt-test/source-dependencies/constructors/changes/B2.scala
index 701f0514685f..7b1399a8ac49 100644
--- a/sbt-test/source-dependencies/constructors/changes/B2.scala
+++ b/sbt-test/source-dependencies/constructors/changes/B2.scala
@@ -1 +1,3 @@
+package example
+
 class B { val y = new A("a") }