diff --git a/src/pkg/runtime/windows/runtime_defs.go b/src/pkg/runtime/windows/runtime_defs.go
index 3a0917a2510..34a9b325978 100644
--- a/src/pkg/runtime/windows/runtime_defs.go
+++ b/src/pkg/runtime/windows/runtime_defs.go
@@ -6,6 +6,8 @@
 
 package runtime
 
+import "unsafe"
+
 const (
 	Windows = 1
 )