diff --git a/main/src/main/scala/sbt/internal/BuildStructure.scala b/main/src/main/scala/sbt/internal/BuildStructure.scala
index e8255c794..3ac97d14d 100644
--- a/main/src/main/scala/sbt/internal/BuildStructure.scala
+++ b/main/src/main/scala/sbt/internal/BuildStructure.scala
@@ -288,8 +288,8 @@ final class PartBuildUnit(
 object BuildStreams {
   type Streams = sbt.std.Streams[ScopedKey[_]]
 
-  final val GlobalPath = "$global"
-  final val BuildUnitPath = "$build"
+  final val GlobalPath = "_global"
+  final val BuildUnitPath = "_build"
   final val StreamsDirectory = "streams"
 
   def mkStreams(
diff --git a/sbt/src/server-test/completions/target/streams/test/$global/$global/definedTestNames/data b/sbt/src/server-test/completions/target/streams/test/_global/_global/definedTestNames/data
similarity index 100%
rename from sbt/src/server-test/completions/target/streams/test/$global/$global/definedTestNames/data
rename to sbt/src/server-test/completions/target/streams/test/_global/_global/definedTestNames/data