diff --git a/renderdoc/driver/vulkan/vk_outputwindow.cpp b/renderdoc/driver/vulkan/vk_outputwindow.cpp
index dcab11108..a0907f8f1 100644
--- a/renderdoc/driver/vulkan/vk_outputwindow.cpp
+++ b/renderdoc/driver/vulkan/vk_outputwindow.cpp
@@ -208,7 +208,7 @@ void VulkanReplay::OutputWindow::Create(WrappedVulkan *driver, VkDevice device,
 
   if(m_WindowSystem != WindowingSystem::Headless)
   {
-    VkSurfaceCapabilitiesKHR capabilities;
+    VkSurfaceCapabilitiesKHR capabilities = {};
 
     ObjDisp(inst)->GetPhysicalDeviceSurfaceCapabilitiesKHR(Unwrap(phys), Unwrap(surface),
                                                            &capabilities);