diff --git a/src/runtime/noasm.go b/src/runtime/noasm.go
index b7e3f82f8e..998309e828 100644
--- a/src/runtime/noasm.go
+++ b/src/runtime/noasm.go
@@ -9,6 +9,8 @@
 
 package runtime
 
+import _ "unsafe"
+
 func cmpstring(s1, s2 string) int {
 	l := len(s1)
 	if len(s2) < l {