1 files changed, 4 insertions, 1 deletions
diff --git a/rts/sm/CNF.c b/rts/sm/CNF.c
index f85b390414..87d1d84f50 100644
--- a/rts/sm/CNF.c
+++ b/rts/sm/CNF.c
@@ -276,7 +276,10 @@ compactFree(StgCompactNFData *str)
     for ( ; block; block = next) {
         next = block->next;
         bd = Bdescr((StgPtr)block);
-        ASSERT((bd->flags & BF_EVACUATED) == 0);
+        ASSERT(RtsFlags.GcFlags.useNonmoving || ((bd->flags & BF_EVACUATED) == 0));
+            // When using the non-moving collector we leave compact object
+            // evacuated to the oldset gen as BF_EVACUATED to avoid evacuating
+            // objects in the non-moving heap.
         freeGroup(bd);
     }
 }