diff --git a/tests/qtest/ivshmem-test.c b/tests/qtest/ivshmem-test.c
index d5c8b9f12853bd4d3fff15b090b2cb53b7cf53c3..dfa69424ed90ca3bcf2ec441a1fa2df7bdcdd6c2 100644
--- a/tests/qtest/ivshmem-test.c
+++ b/tests/qtest/ivshmem-test.c
@@ -135,7 +135,7 @@ static void setup_vm_cmd(IVState *s, const char *cmd, bool msix)
 static void setup_vm(IVState *s)
 {
     char *cmd = g_strdup_printf("-object memory-backend-file"
-                                ",id=mb1,size=1M,share,mem-path=/dev/shm%s"
+                                ",id=mb1,size=1M,share=on,mem-path=/dev/shm%s"
                                 " -device ivshmem-plain,memdev=mb1", tmpshm);
 
     setup_vm_cmd(s, cmd, false);