diff --git a/include/Nazara/VulkanRenderer/VulkanUploadPool.hpp b/include/Nazara/VulkanRenderer/VulkanUploadPool.hpp
index fc8c9daf5..ede6eb297 100644
--- a/include/Nazara/VulkanRenderer/VulkanUploadPool.hpp
+++ b/include/Nazara/VulkanRenderer/VulkanUploadPool.hpp
@@ -44,7 +44,7 @@ namespace Nz
 			{
 				Vk::DeviceMemory blockMemory;
 				Vk::Buffer buffer;
-				UInt64 freeOffset;
+				UInt64 freeOffset = 0;
 			};
 
 			UInt64 m_blockSize;
diff --git a/src/Nazara/OpenGLRenderer/OpenGLUploadPool.cpp b/src/Nazara/OpenGLRenderer/OpenGLUploadPool.cpp
index 54901ee8d..6387f4ca5 100644
--- a/src/Nazara/OpenGLRenderer/OpenGLUploadPool.cpp
+++ b/src/Nazara/OpenGLRenderer/OpenGLUploadPool.cpp
@@ -52,6 +52,8 @@ namespace Nz
 		allocationData.mappedPtr = static_cast<UInt8*>(bestBlock.block->memory.data()) + bestBlock.offset;
 		allocationData.size = size;
 
+		bestBlock.block->freeOffset += size;
+
 		return allocationData;
 	}
 
diff --git a/src/Nazara/VulkanRenderer/VulkanUploadPool.cpp b/src/Nazara/VulkanRenderer/VulkanUploadPool.cpp
index cc8a768c0..3949104f4 100644
--- a/src/Nazara/VulkanRenderer/VulkanUploadPool.cpp
+++ b/src/Nazara/VulkanRenderer/VulkanUploadPool.cpp
@@ -50,7 +50,7 @@ namespace Nz
 		{
 			Block newBlock;
 			if (!newBlock.buffer.Create(m_device, 0U, m_blockSize, VK_BUFFER_USAGE_TRANSFER_SRC_BIT))
-				throw std::runtime_error("Failed to create block buffer: " + TranslateVulkanError(newBlock.buffer.GetLastErrorCode()));
+				throw std::runtime_error("failed to create block buffer: " + TranslateVulkanError(newBlock.buffer.GetLastErrorCode()));
 
 			VkMemoryRequirements requirement = newBlock.buffer.GetMemoryRequirements();
 
@@ -74,6 +74,8 @@ namespace Nz
 		allocationData.offset = bestBlock.alignedOffset;
 		allocationData.size = size;
 
+		bestBlock.block->freeOffset += size;
+
 		return allocationData;
 	}