diff --git a/project/scripts/cmdTests b/project/scripts/cmdTests
index 07d631944a7c..1704fe749d14 100755
--- a/project/scripts/cmdTests
+++ b/project/scripts/cmdTests
@@ -18,6 +18,10 @@ echo "testing sbt dotc -decompile"
 "$SBT" ";dotc -decompile -color:never -classpath $OUT $MAIN" > "$tmp"
 grep -qe "def main(args: scala.Array\[scala.Predef.String\]): scala.Unit =" "$tmp"
 
+echo "testing sbt dotc -decompile from file"
+"$SBT" ";dotc -decompile -color:never -classpath $OUT $OUT/$TASTY" > "$tmp"
+grep -qe "def main(args: scala.Array\[scala.Predef.String\]): scala.Unit =" "$tmp"
+
 echo "testing sbt dotr with no -classpath"
 clear_out "$OUT"
 "$SBT" ";dotc $SOURCE ; dotr $MAIN" > "$tmp"
diff --git a/project/scripts/cmdTestsCommon.inc.sh b/project/scripts/cmdTestsCommon.inc.sh
index a5e3ed7c1c5f..1247481aec12 100644
--- a/project/scripts/cmdTestsCommon.inc.sh
+++ b/project/scripts/cmdTestsCommon.inc.sh
@@ -5,6 +5,7 @@ SBT="./project/scripts/sbt" # if run on CI
 
 SOURCE="tests/pos/HelloWorld.scala"
 MAIN="HelloWorld"
+TASTY="HelloWorld.tasty"
 EXPECTED_OUTPUT="hello world"
 
 OUT=$(mktemp -d)