diff --git a/vulkan/vulkan_context.cpp b/vulkan/vulkan_context.cpp
index 4c951cbe..f8bd76c0 100644
--- a/vulkan/vulkan_context.cpp
+++ b/vulkan/vulkan_context.cpp
@@ -204,7 +204,7 @@ bool Context::init_device(int preferred_device)
     auto device_list = instance->enumeratePhysicalDevices().value;
 
     if (preferred_device > -1 &&
-        preferred_device < device_list.size() &&
+        (size_t)preferred_device < device_list.size() &&
         check_extensions(device_list[preferred_device]))
     {
         physical_device = device_list[preferred_device];
diff --git a/vulkan/vulkan_swapchain.cpp b/vulkan/vulkan_swapchain.cpp
index 12fbc676..762dda15 100644
--- a/vulkan/vulkan_swapchain.cpp
+++ b/vulkan/vulkan_swapchain.cpp
@@ -126,7 +126,7 @@ bool Swapchain::create(unsigned int desired_num_swapchain_images, int new_width,
 
     // If extents aren't reported (Wayland), we have to rely on Wayland to report
     // the size, so keep current extent.
-    if (surface_capabilities.currentExtent.width != -1)
+    if (surface_capabilities.currentExtent.width != UINT32_MAX)
         extents = surface_capabilities.currentExtent;
 
     uint32_t graphics_queue_index = 0;