diff --git a/bin/brew b/bin/brew
index bb0551c535..a6cf108539 100755
--- a/bin/brew
+++ b/bin/brew
@@ -59,7 +59,8 @@ do
   export "$VAR_NEW"="${!VAR}"
 done
 
-if [[ -n "$HOMEBREW_ENV_FILTERING" ]]
+# test-bot sets environment filtering itself
+if [[ -n "$HOMEBREW_ENV_FILTERING" && "$1" != "test-bot" ]]
 then
   PATH="/usr/bin:/bin:/usr/sbin:/sbin"