diff --git a/src/d3d9/d3d9_swapchain.cpp b/src/d3d9/d3d9_swapchain.cpp
index 606bd192..d6e52dd6 100644
--- a/src/d3d9/d3d9_swapchain.cpp
+++ b/src/d3d9/d3d9_swapchain.cpp
@@ -1117,8 +1117,9 @@ namespace dxvk {
 
     switch (Format) {
       default:
-        Logger::warn(str::format("D3D9SwapChainEx: Unexpected format: ", Format));
-        
+        Logger::warn(str::format("D3D9SwapChainEx: Unexpected format: ", Format));      
+     [[fallthrough]];
+
       case D3D9Format::A8R8G8B8:
       case D3D9Format::X8R8G8B8:
       case D3D9Format::A8B8G8R8:
@@ -1138,12 +1139,12 @@ namespace dxvk {
         pDstFormats[n++] = { VK_FORMAT_B5G5R5A1_UNORM_PACK16, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
         pDstFormats[n++] = { VK_FORMAT_R5G5B5A1_UNORM_PACK16, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
         pDstFormats[n++] = { VK_FORMAT_A1R5G5B5_UNORM_PACK16, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
-      }
+      } break;
 
       case D3D9Format::R5G6B5: {
         pDstFormats[n++] = { VK_FORMAT_B5G6R5_UNORM_PACK16, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
         pDstFormats[n++] = { VK_FORMAT_R5G6B5_UNORM_PACK16, VK_COLOR_SPACE_SRGB_NONLINEAR_KHR };
-      }
+      } break;
     }
 
     return n;