diff --git a/main-command/src/main/scala/sbt/internal/server/Server.scala b/main-command/src/main/scala/sbt/internal/server/Server.scala
index 0b8ee4b32..4fb8a7cb4 100644
--- a/main-command/src/main/scala/sbt/internal/server/Server.scala
+++ b/main-command/src/main/scala/sbt/internal/server/Server.scala
@@ -174,7 +174,7 @@ private[sbt] object Server {
           auth match {
             case _ if auth(ServerAuthentication.Token) =>
               writeTokenfile()
-              PortFile(uri, Option(tokenfile.toString), Option(tokenfile.toURI.toString))
+              PortFile(uri, Option(tokenfile.toString), Option(IO.toURI(tokenfile).toString))
             case _ =>
               PortFile(uri, None, None)
           }
diff --git a/main/src/main/scala/sbt/internal/CommandExchange.scala b/main/src/main/scala/sbt/internal/CommandExchange.scala
index 32175d256..39259ee28 100644
--- a/main/src/main/scala/sbt/internal/CommandExchange.scala
+++ b/main/src/main/scala/sbt/internal/CommandExchange.scala
@@ -28,7 +28,7 @@ import scala.concurrent.Await
 import scala.concurrent.duration.Duration
 import scala.util.{ Success, Failure }
 import sbt.io.syntax._
-import sbt.io.Hash
+import sbt.io.{ Hash, IO }
 import sbt.internal.server._
 import sbt.internal.langserver.{ LogMessageParams, MessageType }
 import sbt.internal.util.{ StringEvent, ObjectEvent, MainAppender }
@@ -135,7 +135,7 @@ private[sbt] final class CommandExchange {
       case Some(_) => // do nothing
       case _ =>
         val portfile = (new File(".")).getAbsoluteFile / "project" / "target" / "active.json"
-        val h = Hash.halfHashString(portfile.toURI.toString)
+        val h = Hash.halfHashString(IO.toURI(portfile).toString)
         val tokenfile = BuildPaths.getGlobalBase(s) / "server" / h / "token.json"
         val socketfile = BuildPaths.getGlobalBase(s) / "server" / h / "sock"
         val pipeName = "sbt-server-" + h
diff --git a/main/src/main/scala/sbt/internal/server/Definition.scala b/main/src/main/scala/sbt/internal/server/Definition.scala
index 4459861db..0c39d15cd 100644
--- a/main/src/main/scala/sbt/internal/server/Definition.scala
+++ b/main/src/main/scala/sbt/internal/server/Definition.scala
@@ -9,6 +9,7 @@ package sbt
 package internal
 package server
 
+import sbt.io.IO
 import sbt.internal.inc.MixedAnalyzingCompiler
 import sbt.internal.langserver.ErrorCodes
 import sbt.util.Logger
@@ -297,7 +298,7 @@ private[sbt] object Definition {
                   textProcessor.markPosition(classFile, sym).collect {
                     case (file, line, from, to) =>
                       import sbt.internal.langserver.{ Location, Position, Range }
-                      Location(file.toURI.toURL.toString,
+                      Location(IO.toURI(file).toString,
                                Range(Position(line, from), Position(line, to)))
                   }
                 }
diff --git a/main/src/main/scala/sbt/internal/server/LanguageServerReporter.scala b/main/src/main/scala/sbt/internal/server/LanguageServerReporter.scala
index 90d947a3d..28551be7c 100644
--- a/main/src/main/scala/sbt/internal/server/LanguageServerReporter.scala
+++ b/main/src/main/scala/sbt/internal/server/LanguageServerReporter.scala
@@ -24,6 +24,7 @@ import sbt.internal.langserver.{
 import sbt.internal.inc.JavaInterfaceUtil._
 import scala.collection.mutable
 import scala.collection.JavaConverters._
+import sbt.io.IO
 
 /**
  * Defines a compiler reporter that uses event logging provided by a [[ManagedLogger]].
@@ -82,7 +83,7 @@ class LanguageServerReporter(
     import sbt.internal.langserver.codec.JsonProtocol._
     val files = analysis.readSourceInfos.getAllSourceInfos.keySet.asScala
     files foreach { f =>
-      val params = PublishDiagnosticsParams(f.toURI.toString, Vector())
+      val params = PublishDiagnosticsParams(IO.toURI(f).toString, Vector())
       exchange.notifyEvent("textDocument/publishDiagnostics", params)
     }
   }
@@ -94,7 +95,7 @@ class LanguageServerReporter(
       problemsByFile.get(sourceFile) match {
         case Some(xs: List[Problem]) =>
           val ds = toDiagnostics(xs)
-          val params = PublishDiagnosticsParams(sourceFile.toURI.toString, ds)
+          val params = PublishDiagnosticsParams(IO.toURI(sourceFile).toString, ds)
           exchange.notifyEvent("textDocument/publishDiagnostics", params)
         case _ =>
       }