diff --git a/src/coreclr/gc/gc.cpp b/src/coreclr/gc/gc.cpp
index 1932132867aa97..e2ce9b5bbe2b9d 100644
--- a/src/coreclr/gc/gc.cpp
+++ b/src/coreclr/gc/gc.cpp
@@ -43088,6 +43088,7 @@ unsigned int GCHeap::GetGenerationWithRange (Object* object, uint8_t** ppStart,
         }
         if (generation == -1)
         {
+            generation = max_generation;
             *ppStart = heap_segment_mem (hs);
             *ppAllocated = *ppReserved = generation_allocation_start (hp->generation_of (max_generation - 1));
         }