diff --git a/src/pkg/runtime/alg.go b/src/pkg/runtime/alg.go
index 9d06197f27..000d4a18b7 100644
--- a/src/pkg/runtime/alg.go
+++ b/src/pkg/runtime/alg.go
@@ -37,13 +37,15 @@ const (
 	alg_max
 )
 
+const nacl = GOOS == "nacl"
+
 var use_aeshash bool
 
 // in asm_*.s
 func aeshash(p unsafe.Pointer, s uintptr, h uintptr) uintptr
 
 func memhash(p unsafe.Pointer, s uintptr, h uintptr) uintptr {
-	if use_aeshash {
+	if !nacl && use_aeshash {
 		return aeshash(p, s, h)
 	}