1 files changed, 1 insertions, 1 deletions
diff --git a/blockdev.c b/blockdev.c
index d05a8740f4..6c7be7c522 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2991,7 +2991,7 @@ static void blockdev_mirror_common(const char *job_id, BlockDriverState *bs,
     }
     if (granularity & (granularity - 1)) {
         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "granularity",
-                   "power of 2");
+                   "a power of 2");
         return;
     }