diff --git a/c/libuv/libuv.go b/c/libuv/libuv.go
index 39c0f94b..0a6833d2 100644
--- a/c/libuv/libuv.go
+++ b/c/libuv/libuv.go
@@ -99,7 +99,8 @@ type Loop struct {
 }
 
 type Poll struct {
-	Unused [0]byte
+	Data   c.Pointer
+	Unused [160]byte
 }
 
 /* Request types. */
diff --git a/c/libuv/signal.go b/c/libuv/signal.go
index f2aa9ea7..3425acb8 100644
--- a/c/libuv/signal.go
+++ b/c/libuv/signal.go
@@ -9,7 +9,7 @@ import (
 /* Handle types. */
 
 type Signal struct {
-	Unused [0]byte
+	Unused [152]byte
 }
 
 // ----------------------------------------------