diff --git a/drd/tests/circular_buffer.vgtest b/drd/tests/circular_buffer.vgtest
index ef01f9a2a..06c02f228 100644
--- a/drd/tests/circular_buffer.vgtest
+++ b/drd/tests/circular_buffer.vgtest
@@ -1,2 +1,3 @@
+prereq: ./supported_libpthread
 prog: circular_buffer
 args: -q