diff --git a/mm/slob.c b/mm/slob.c
index 773a7aa80ab5ce53883cd7ad4d07a6019a175fe0..c56c5e57c19261b7ae26ff6468674cd618b8381b 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -398,6 +398,10 @@ static void slob_free(void *block, int size)
 	sp->units += units;
 
 	if (b < sp->free) {
+		if (b + units == sp->free) {
+			units += slob_units(sp->free);
+			sp->free = slob_next(sp->free);
+		}
 		set_slob(b, units, sp->free);
 		sp->free = b;
 	} else {