diff --git a/platform/script-debugger/backend/src/org/jetbrains/debugger/sourcemap/SourceResolver.kt b/platform/script-debugger/backend/src/org/jetbrains/debugger/sourcemap/SourceResolver.kt
index 7fc21aeea3dd..ca16633290ef 100644
--- a/platform/script-debugger/backend/src/org/jetbrains/debugger/sourcemap/SourceResolver.kt
+++ b/platform/script-debugger/backend/src/org/jetbrains/debugger/sourcemap/SourceResolver.kt
@@ -138,7 +138,7 @@ class SourceResolver(private val rawSources: List<String>, internal val canonica
 
 fun canonicalizePath(url: String, baseUrl: Url, baseUrlIsFile: Boolean): String {
   var path = url
-  if (url[0] != '/') {
+  if (!FileUtil.isAbsolute(url)) {
     val basePath = baseUrl.path
     if (baseUrlIsFile) {
       val lastSlashIndex = basePath.lastIndexOf('/')