diff --git a/idea/src/org/jetbrains/kotlin/idea/debugger/PositionManagerLibraryClassFileSearcher.kt b/idea/src/org/jetbrains/kotlin/idea/debugger/PositionManagerLibraryClassFileSearcher.kt
index a2f5fca99e5..90aea2f34f4 100644
--- a/idea/src/org/jetbrains/kotlin/idea/debugger/PositionManagerLibraryClassFileSearcher.kt
+++ b/idea/src/org/jetbrains/kotlin/idea/debugger/PositionManagerLibraryClassFileSearcher.kt
@@ -107,7 +107,7 @@ private fun findPackagePartFileNamesForElement(elementAt: JetElement): List<Stri
     val file = elementAt.getContainingJetFile()
 
     val packagePartName = PackagePartClassUtils.getPackagePartFqName(file).shortName().asString()
-    val packagePartNameWoHash = packagePartName.substring(0, packagePartName.lastIndexOf("$"))
+    val packagePartNameWoHash = packagePartName.substring(0, packagePartName.lastIndexOf("$") + 1)
 
     val libraryEntry = LibraryUtil.findLibraryEntry(file.getVirtualFile(), project)
     val scope = if (libraryEntry is LibraryOrderEntry){