diff --git a/appveyor.yml b/appveyor.yml
index 97756de2..2a518090 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -12,7 +12,7 @@ install:
         [System.IO.Compression.ZipFile]::ExtractToDirectory("C:\sbt-bin.zip", "C:\sbt")
       }
   - cmd: SET PATH=C:\sbt\sbt\bin;%JAVA_HOME%\bin;%PATH%
-  - cmd: SET SBT_OPTS=-XX:MaxPermSize=2g -Xmx4g
+  - cmd: SET SBT_OPTS=-XX:MaxPermSize=2g -Xmx4g -Dfile.encoding=UTF8
 build_script:
   - sbt clean compile
 test_script:
diff --git a/build.sbt b/build.sbt
index 73cde108..80912a1c 100644
--- a/build.sbt
+++ b/build.sbt
@@ -60,7 +60,7 @@ lazy val plugin = project
     scriptedSettings,
     scriptedLaunchOpts += ("-Dproject.version=" + version.value),
     scriptedLaunchOpts ++= sys.process.javaVmArguments.filter(
-      a => Seq("-Xmx", "-Xms", "-XX").exists(a.startsWith)
+      a => Seq("-Xmx", "-Xms", "-XX", "-Dfile").exists(a.startsWith)
     ),
     scriptedDependencies := {
       val p1 = (publishLocal in core).value