diff --git a/src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp b/src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp
index 1e63d56844c..fda97c4836e 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahConcurrentGC.cpp
@@ -640,6 +640,10 @@ void ShenandoahConcurrentGC::op_reset() {
   } else {
     _generation->prepare_gc();
   }
+
+  if (heap->mode()->is_generational()) {
+    heap->old_generation()->card_scan()->mark_read_table_as_clean();
+  }
 }
 
 class ShenandoahInitMarkUpdateRegionStateClosure : public ShenandoahHeapRegionClosure {
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahDegeneratedGC.cpp b/src/hotspot/share/gc/shenandoah/shenandoahDegeneratedGC.cpp
index 0f21775c58c..c941379d576 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahDegeneratedGC.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahDegeneratedGC.cpp
@@ -136,11 +136,15 @@ void ShenandoahDegenGC::op_degenerated() {
       heap->set_unload_classes(_generation->heuristics()->can_unload_classes() &&
                                 (!heap->mode()->is_generational() || _generation->is_global()));
 
-      op_reset();
+      if (heap->mode()->is_generational()) {
+        // Clean the read table before swapping it. The end goal here is to have a clean
+        // write table, and to have the read table updated with the previous write table.
+        heap->old_generation()->card_scan()->mark_read_table_as_clean();
 
-      if (heap->mode()->is_generational() && _generation->is_young()) {
-        // Swap remembered sets for young
-        _generation->swap_card_tables();
+        if (_generation->is_young()) {
+          // Swap remembered sets for young
+          _generation->swap_card_tables();
+        }
       }
 
     case _degenerated_roots:
@@ -178,6 +182,8 @@ void ShenandoahDegenGC::op_degenerated() {
         }
       }
 
+      op_reset();
+
       // STW mark
       op_mark();
 
diff --git a/src/hotspot/share/gc/shenandoah/shenandoahGeneration.cpp b/src/hotspot/share/gc/shenandoah/shenandoahGeneration.cpp
index 53e462d2d38..9a511de939c 100644
--- a/src/hotspot/share/gc/shenandoah/shenandoahGeneration.cpp
+++ b/src/hotspot/share/gc/shenandoah/shenandoahGeneration.cpp
@@ -246,11 +246,6 @@ void ShenandoahGeneration::merge_write_table() {
 
 void ShenandoahGeneration::prepare_gc() {
   reset_mark_bitmap<true>();
-
-  ShenandoahHeap* const heap = ShenandoahHeap::heap();
-  if (heap->mode()->is_generational()) {
-    heap->old_generation()->card_scan()->mark_read_table_as_clean();
-  }
 }
 
 void ShenandoahGeneration::parallel_heap_region_iterate_free(ShenandoahHeapRegionClosure* cl) {