diff --git a/src/gfx_device_vulkan.cpp b/src/gfx_device_vulkan.cpp
index 447f101..a011b75 100644
--- a/src/gfx_device_vulkan.cpp
+++ b/src/gfx_device_vulkan.cpp
@@ -98,6 +98,7 @@ namespace engine {
 			case gfx::VertexAttribFormat::VEC3:
 				return VK_FORMAT_R32G32B32_SFLOAT;
 			}
+			throw std::runtime_error("Unknown vertex attribute format");
 		}
 	}