diff --git a/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala b/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala
index aae9728ac..847091165 100644
--- a/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala
+++ b/src/main/scala/li/cil/oc/server/fs/FileInputStreamFileSystem.scala
@@ -38,7 +38,7 @@ trait FileInputStreamFileSystem extends InputStreamFileSystem {
     case file if file.exists() && file.isFile => Array(file.getName)
     case directory if directory.exists() && directory.isDirectory && directory.list() != null =>
       directory.listFiles().map(file => if (file.isDirectory) file.getName + "/" else file.getName)
-    case _ => throw new io.FileNotFoundException("No such file or directory: " + path)
+    case _ => throw new io.FileNotFoundException("no such file or directory: " + path)
   }
 
   // ----------------------------------------------------------------------- //
diff --git a/src/main/scala/li/cil/oc/server/fs/ReadOnlyWrapper.scala b/src/main/scala/li/cil/oc/server/fs/ReadOnlyWrapper.scala
index f5f7783c4..2c4a2dde5 100644
--- a/src/main/scala/li/cil/oc/server/fs/ReadOnlyWrapper.scala
+++ b/src/main/scala/li/cil/oc/server/fs/ReadOnlyWrapper.scala
@@ -33,8 +33,8 @@ private class ReadOnlyWrapper(val fileSystem: api.fs.FileSystem) extends api.fs.
 
   override def open(path: String, mode: Mode) = mode match {
     case Mode.Read => fileSystem.open(path, mode)
-    case Mode.Write => throw new FileNotFoundException("Read-only filesystem; cannot open for writing: " + path)
-    case Mode.Append => throw new FileNotFoundException("Read-only filesystem; cannot open for appending: " + path)
+    case Mode.Write => throw new FileNotFoundException("read-only filesystem; cannot open for writing: " + path)
+    case Mode.Append => throw new FileNotFoundException("read-only filesystem; cannot open for appending: " + path)
   }
 
   override def getHandle(handle: Int) = fileSystem.getHandle(handle)