diff --git a/compiler/src/dotty/tools/dotc/Driver.scala b/compiler/src/dotty/tools/dotc/Driver.scala
index 349147dc81a9..7349c4615938 100644
--- a/compiler/src/dotty/tools/dotc/Driver.scala
+++ b/compiler/src/dotty/tools/dotc/Driver.scala
@@ -17,7 +17,7 @@ import fromtasty.TASTYCompiler
 class Driver extends DotClass {
 
   protected def newCompiler(implicit ctx: Context): Compiler =
-    if (ctx.settings.tasty.value) new TASTYCompiler
+    if (ctx.settings.fromTasty.value) new TASTYCompiler
     else new Compiler
 
   protected def emptyReporter: Reporter = new StoreReporter(null)
diff --git a/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala b/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
index 092918832a5d..c34f6759d148 100644
--- a/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
+++ b/compiler/src/dotty/tools/dotc/config/ScalaSettings.scala
@@ -42,7 +42,7 @@ class ScalaSettings extends Settings.SettingGroup {
   val language = MultiStringSetting("-language", "feature", "Enable one or more language features.")
   val rewrite = OptionSetting[Rewrites]("-rewrite", "When used in conjunction with -language:Scala2 rewrites sources to migrate to new syntax")
   val silentWarnings = BooleanSetting("-nowarn", "Silence all warnings.")
-  val tasty = BooleanSetting("-tasty", "Compile classes from tasty in classpath. The arguments are used as class names.")
+  val fromTasty = BooleanSetting("-from-tasty", "Compile classes from tasty in classpath. The arguments are used as class names.")
 
   /** -X "Advanced" settings
    */
diff --git a/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala b/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala
index abe7ff5a2ae7..89b9c03aa55d 100644
--- a/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala
+++ b/compiler/src/dotty/tools/dotc/core/SymbolLoaders.scala
@@ -337,7 +337,7 @@ class ClassfileLoader(val classfile: AbstractFile) extends SymbolLoader {
   }
 
   private def mayLoadTreesFromTasty(implicit ctx: Context): Boolean =
-    ctx.settings.YretainTrees.value || ctx.settings.XlinkOptimise.value || ctx.settings.tasty.value
+    ctx.settings.YretainTrees.value || ctx.settings.XlinkOptimise.value || ctx.settings.fromTasty.value
 }
 
 class SourcefileLoader(val srcfile: AbstractFile) extends SymbolLoader {
diff --git a/compiler/test/dotty/tools/vulpix/ParallelTesting.scala b/compiler/test/dotty/tools/vulpix/ParallelTesting.scala
index ec9fd31ce5d8..d9b2fc284638 100644
--- a/compiler/test/dotty/tools/vulpix/ParallelTesting.scala
+++ b/compiler/test/dotty/tools/vulpix/ParallelTesting.scala
@@ -395,7 +395,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
     protected def compileFromTasty(flags0: TestFlags, suppressErrors: Boolean, targetDir: JFile): TestReporter = {
       val tastyOutput = new JFile(targetDir.getPath + "_from-tasty")
       tastyOutput.mkdir()
-      val flags = flags0 and ("-d", tastyOutput.getAbsolutePath) and "-tasty"
+      val flags = flags0 and ("-d", tastyOutput.getAbsolutePath) and "-from-tasty"
 
       def hasTastyFileToClassName(f: JFile): String =
         targetDir.toPath.relativize(f.toPath).toString.dropRight(".hasTasty".length).replace('/', '.')
@@ -1099,7 +1099,7 @@ trait ParallelTesting extends RunnerOrchestration { self =>
     val target = JointCompilationSource(
       testGroup.name,
       Array(sourceFile),
-      flags.withClasspath(tastySource.getPath) and "-tasty",
+      flags.withClasspath(tastySource.getPath) and "-from-tasty",
       tastySource,
       fromTasty = true
     )
diff --git a/project/scripts/sbtBootstrappedTests b/project/scripts/sbtBootstrappedTests
index 587b43cd54c2..9704a0bd1a83 100755
--- a/project/scripts/sbtBootstrappedTests
+++ b/project/scripts/sbtBootstrappedTests
@@ -21,11 +21,11 @@ mkdir out/scriptedtest0
 
 
 # check that `dotc` compiles and `dotr` runs it
-echo "testing sbt dotc -tasty and dotr -classpath"
+echo "testing sbt dotc -from-tasty and dotr -classpath"
 mkdir out/scriptedtest1
 mkdir out/scriptedtest2
 ./bin/dotc tests/pos/sbtDotrTest.scala -d out/scriptedtest1/
-./bin/dotc -tasty -classpath out/scriptedtest1/ -d out/scriptedtest2/ dotrtest.Test
+./bin/dotc -from-tasty -classpath out/scriptedtest1/ -d out/scriptedtest2/ dotrtest.Test
 # FIXME #3477
 #./bin/dotr -classpath out/scriptedtest2/ dotrtest.Test" > sbtdotr2.out
 #if grep -e "dotr test ok" sbtdotr2.out; then
diff --git a/project/scripts/sbtTests b/project/scripts/sbtTests
index b151129dbe77..61d4c4dd84ee 100755
--- a/project/scripts/sbtTests
+++ b/project/scripts/sbtTests
@@ -15,10 +15,10 @@ else
 fi
 
 # check that `sbt dotc` compiles and `sbt dotr` runs it
-echo "testing sbt dotc -tasty and dotr -classpath"
+echo "testing sbt dotc -from-tasty and dotr -classpath"
 mkdir out/scriptedtest1
 mkdir out/scriptedtest2
-./project/scripts/sbt ";dotc tests/pos/sbtDotrTest.scala -d out/scriptedtest1/; dotc -tasty -classpath out/scriptedtest1/ -d out/scriptedtest2/ dotrtest.Test; dotr -classpath out/scriptedtest2/ dotrtest.Test" > sbtdotr2.out
+./project/scripts/sbt ";dotc tests/pos/sbtDotrTest.scala -d out/scriptedtest1/; dotc -from-tasty -classpath out/scriptedtest1/ -d out/scriptedtest2/ dotrtest.Test; dotr -classpath out/scriptedtest2/ dotrtest.Test" > sbtdotr2.out
 cat sbtdotr2.out
 if grep -e "dotr test ok" sbtdotr2.out; then
     echo "output ok"