diff --git a/tools/arkmanager b/tools/arkmanager
index 01fd811..0b189fa 100755
--- a/tools/arkmanager
+++ b/tools/arkmanager
@@ -767,7 +767,7 @@ doUpdate() {
       modupdate=1
     elif [ "$arg" == "--backup" ]; then
       arkBackupPreUpdate=true
-    elif [ "$arg" =~ "^--stagingdir=" ]; then
+    elif [[ "$arg" =~ "^--stagingdir=" ]]; then
       arkStagingDir="${ark#--stagingdir=}"
     elif [ "$arg" == "--downloadonly" ]; then
       downloadonly=1