diff --git a/project/Build.scala b/project/Build.scala
index c614c59357ce..1d0055bac866 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -1410,7 +1410,7 @@ object Build {
             val outputDir = languageReferenceConfig.value.get[OutputDir].get.value
             val expectedLinksFile = (file("project") / "scripts" / "expected-links" / "reference-expected-links.txt").toString
             import _root_.scala.sys.process._
-            s"$script $outputDir $expectedLinksFile" !
+            s"$script $outputDir $expectedLinksFile".!
           }
         }