diff --git a/sys/ufs/ffs/ffs_alloc.c b/sys/ufs/ffs/ffs_alloc.c
index 6cbec2d151e6..636e8e67257e 100644
--- a/sys/ufs/ffs/ffs_alloc.c
+++ b/sys/ufs/ffs/ffs_alloc.c
@@ -484,8 +484,8 @@ static int doreallocblks = 1;
 SYSCTL_INT(_vfs_ffs, OID_AUTO, doreallocblks, CTLFLAG_RW, &doreallocblks, 0,
 "enable block reallocation");
 
-static int dotrimcons = 0;
-SYSCTL_INT(_vfs_ffs, OID_AUTO, dotrimcons, CTLFLAG_RW, &dotrimcons, 0,
+static int dotrimcons = 1;
+SYSCTL_INT(_vfs_ffs, OID_AUTO, dotrimcons, CTLFLAG_RWTUN, &dotrimcons, 0,
 "enable BIO_DELETE / TRIM consolidation");
 
 static int maxclustersearch = 10;