diff --git a/BUILD.gn b/BUILD.gn
index f811cf0..c4c802e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -116,7 +116,7 @@
 }
 
 # Targets below this are only visible within this file.
-visibility = ":*"
+visibility = [ ":*" ]
 
 component("safemath") {
   sources = [