diff --git a/include/Nazara/Vulkan/VkDeviceObject.hpp b/include/Nazara/Vulkan/VkDeviceObject.hpp
index 210980a17..afa6a4c55 100644
--- a/include/Nazara/Vulkan/VkDeviceObject.hpp
+++ b/include/Nazara/Vulkan/VkDeviceObject.hpp
@@ -39,7 +39,7 @@ namespace Nz
 				DeviceHandle m_device;
 				VkAllocationCallbacks m_allocator;
 				VkType m_handle;
-				VkResult m_lastErrorCode;
+				mutable VkResult m_lastErrorCode;
 		};
 	}
 }
diff --git a/include/Nazara/Vulkan/VkSwapchain.hpp b/include/Nazara/Vulkan/VkSwapchain.hpp
index fbe8d2118..b55fad75e 100644
--- a/include/Nazara/Vulkan/VkSwapchain.hpp
+++ b/include/Nazara/Vulkan/VkSwapchain.hpp
@@ -24,7 +24,7 @@ namespace Nz
 				Swapchain(Swapchain&&) = default;
 				~Swapchain() = default;
 
-				inline bool AcquireNextImage(Nz::UInt64 timeout, VkSemaphore semaphore, VkFence fence, UInt32* imageIndex);
+				inline bool AcquireNextImage(Nz::UInt64 timeout, VkSemaphore semaphore, VkFence fence, UInt32* imageIndex) const;
 
 				inline bool Create(const DeviceHandle& device, const VkSwapchainCreateInfoKHR& createInfo, const VkAllocationCallbacks* allocator = nullptr);
 
diff --git a/include/Nazara/Vulkan/VkSwapchain.inl b/include/Nazara/Vulkan/VkSwapchain.inl
index e1f885045..32842d700 100644
--- a/include/Nazara/Vulkan/VkSwapchain.inl
+++ b/include/Nazara/Vulkan/VkSwapchain.inl
@@ -11,7 +11,7 @@ namespace Nz
 {
 	namespace Vk
 	{
-		inline bool Swapchain::AcquireNextImage(Nz::UInt64 timeout, VkSemaphore semaphore, VkFence fence, UInt32* imageIndex)
+		inline bool Swapchain::AcquireNextImage(Nz::UInt64 timeout, VkSemaphore semaphore, VkFence fence, UInt32* imageIndex) const
 		{
 			m_lastErrorCode = m_device->vkAcquireNextImageKHR(*m_device, m_handle, timeout, semaphore, fence, imageIndex);
 			switch (m_lastErrorCode)