diff --git a/test/roundtrip.t b/test/roundtrip.t
index 67a5ecc2b..459a9229c 100755
--- a/test/roundtrip.t
+++ b/test/roundtrip.t
@@ -49,7 +49,7 @@ if (open my $fh, '>', $rc)
 }
 
 # Add two tasks.
-qx{../src/task rc:$rc add priority:H project:A one/1 2>&1};
+qx{../src/task rc:$rc add priority:H project:A -- one/1 2>&1};
 qx{../src/task rc:$rc add +tag1 +tag2 two 2>&1};
 
 # trip 1.