diff --git a/Library/Homebrew/brew.sh b/Library/Homebrew/brew.sh
index c7c42a6c4d..0a73e3b7b6 100644
--- a/Library/Homebrew/brew.sh
+++ b/Library/Homebrew/brew.sh
@@ -414,7 +414,8 @@ update-preinstall() {
   [[ -z "$HOMEBREW_AUTO_UPDATE_CHECKED" ]] || return
   [[ -z "$HOMEBREW_UPDATE_PREINSTALL" ]] || return
 
-  if [[ "$HOMEBREW_COMMAND" = "install" || "$HOMEBREW_COMMAND" = "upgrade" || "$HOMEBREW_COMMAND" = "tap" ||
+  if [[ "$HOMEBREW_COMMAND" = "install" || "$HOMEBREW_COMMAND" = "upgrade" ||
+        "$HOMEBREW_COMMAND" = "tap" && $HOMEBREW_ARG_COUNT -gt 1 ||
         "$HOMEBREW_CASK_COMMAND" = "install" || "$HOMEBREW_CASK_COMMAND" = "upgrade" ]]
   then
     export HOMEBREW_AUTO_UPDATING="1"