diff --git a/include/vk_mem_alloc.h b/include/vk_mem_alloc.h
index 40ad1ad..0d01d51 100644
--- a/include/vk_mem_alloc.h
+++ b/include/vk_mem_alloc.h
@@ -12252,7 +12252,8 @@ VkResult VmaBlockVector::AllocatePage(
         freeMemory = (heapBudget.usage < heapBudget.budget) ? (heapBudget.budget - heapBudget.usage) : 0;
     }
 
-    const bool canFallbackToDedicated = !IsCustomPool();
+    const bool canFallbackToDedicated = !HasExplicitBlockSize() &&
+        (createInfo.flags & VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT) == 0;
     const bool canCreateNewBlock =
         ((createInfo.flags & VMA_ALLOCATION_CREATE_NEVER_ALLOCATE_BIT) == 0) &&
         (m_Blocks.size() < m_MaxBlockCount) &&