diff --git a/platform_mappings b/platform_mappings
index 3ff2236a5..56dc745d7 100644
--- a/platform_mappings
+++ b/platform_mappings
@@ -1,11 +1,11 @@
 platforms:
 #  Maps "--platforms=//tools/toolchains/cross_compile/config:darwin_x86_64"
 #  to "--cpu=darwin".
-  //tools/toolchains/cross_compile/config:darwin_x86_64
+  @xla//tools/toolchains/cross_compile/config:darwin_x86_64
     --cpu=darwin
 
 flags:
   # Maps "--cpu=darwin" to
   # "--platforms=//tools/toolchains/cross_compile/config:darwin_x86_64".
   --cpu=darwin
-    //tools/toolchains/cross_compile/config:darwin_x86_64
+    @xla//tools/toolchains/cross_compile/config:darwin_x86_64