diff --git a/libavutil/vulkan.c b/libavutil/vulkan.c
index 3015a536c2..7858e002ed 100644
--- a/libavutil/vulkan.c
+++ b/libavutil/vulkan.c
@@ -1168,7 +1168,7 @@ int ff_vk_map_buffers(FFVulkanContext *s, FFVkBuffer **buf, uint8_t *mem[],
 }
 
 int ff_vk_flush_buffer(FFVulkanContext *s, FFVkBuffer *buf,
-                       size_t offset, size_t mem_size,
+                       VkDeviceSize offset, VkDeviceSize mem_size,
                        int flush)
 {
     VkResult ret;
diff --git a/libavutil/vulkan.h b/libavutil/vulkan.h
index 868788c2a4..29116bcb2c 100644
--- a/libavutil/vulkan.h
+++ b/libavutil/vulkan.h
@@ -527,7 +527,7 @@ int ff_vk_create_buf(FFVulkanContext *s, FFVkBuffer *buf, size_t size,
  * Flush or invalidate a single buffer, with a given size and offset.
  */
 int ff_vk_flush_buffer(FFVulkanContext *s, FFVkBuffer *buf,
-                       size_t offset, size_t mem_size,
+                       VkDeviceSize offset, VkDeviceSize mem_size,
                        int flush);
 
 /**