diff --git a/libavutil/vulkan.c b/libavutil/vulkan.c
index 0250f5aa39..faf5cd5508 100644
--- a/libavutil/vulkan.c
+++ b/libavutil/vulkan.c
@@ -295,6 +295,8 @@ int ff_vk_create_buf(FFVulkanContext *s, FFVkBuffer *buf, size_t size,
         return AVERROR_EXTERNAL;
     }
 
+    buf->size = size;
+
     return 0;
 }
 
diff --git a/libavutil/vulkan.h b/libavutil/vulkan.h
index d75be26977..f2c4a79102 100644
--- a/libavutil/vulkan.h
+++ b/libavutil/vulkan.h
@@ -94,6 +94,7 @@ typedef struct FFVkBuffer {
     VkBuffer buf;
     VkDeviceMemory mem;
     VkMemoryPropertyFlagBits flags;
+    size_t size;
 } FFVkBuffer;
 
 typedef struct FFVkQueueFamilyCtx {