diff --git a/src/render/vulkan/SDL_render_vulkan.c b/src/render/vulkan/SDL_render_vulkan.c
index 1d4a22d105..81ca222114 100644
--- a/src/render/vulkan/SDL_render_vulkan.c
+++ b/src/render/vulkan/SDL_render_vulkan.c
@@ -2763,7 +2763,7 @@ static VkResult VULKAN_UpdateTextureInternal(VULKAN_RenderData *rendererData, Vk
             length = pitch;
         }
         for (VkDeviceSize row = h; row--; ) {
-            SDL_memcpy(dst, src, length);
+            SDL_memcpy(dst, src, (size_t)length);
             src += pitch;
             dst += length;
         }