diff --git a/tests/coverage/dcache1.S b/tests/coverage/dcache1.S
index 4a9b3de15..d54326d0d 100644
--- a/tests/coverage/dcache1.S
+++ b/tests/coverage/dcache1.S
@@ -80,4 +80,15 @@ main:
       sd zero, 0(t0)
       .word 0x00000013
       .word 0x00000013
+
+# test flushing
+      li t0, 0x80100000
+      cbo.flush (t0)
+      li t0, 0x80101000
+      cbo.flush (t0)
+      li t0, 0x80102000
+      cbo.flush (t0)
+      li t0, 0x80103000
+      cbo.flush (t0)
+
       j done