diff --git a/src/display.rs b/src/display.rs
index 165b06a..db83420 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -231,6 +231,7 @@ pub trait ResolverPool:
     Pool<DescriptorPoolInfo, DescriptorPool>
     + Pool<RenderPassInfo, RenderPass>
     + Pool<CommandBufferInfo, CommandBuffer>
+    + Send
 {
 }
 
@@ -238,5 +239,6 @@ impl<T> ResolverPool for T where
     T: Pool<DescriptorPoolInfo, DescriptorPool>
         + Pool<RenderPassInfo, RenderPass>
         + Pool<CommandBufferInfo, CommandBuffer>
+        + Send
 {
 }