diff --git a/src/cmd/dist/deps.go b/src/cmd/dist/deps.go
index 4425f7a4d9..47560cf33b 100644
--- a/src/cmd/dist/deps.go
+++ b/src/cmd/dist/deps.go
@@ -679,8 +679,9 @@ var builddeps = map[string][]string{
 	},
 
 	"io": {
-		"errors", // io
-		"sync",   // io
+		"errors",      // io
+		"sync",        // io
+		"sync/atomic", // io
 	},
 
 	"io/ioutil": {