diff --git a/Library/Homebrew/cmd/install.rb b/Library/Homebrew/cmd/install.rb
index d964ca2741..7245c5690f 100644
--- a/Library/Homebrew/cmd/install.rb
+++ b/Library/Homebrew/cmd/install.rb
@@ -173,7 +173,7 @@ module Homebrew
           optlinked_version = Keg.for(f.opt_prefix).version
           onoe <<~EOS
             #{f.full_name} #{optlinked_version} is already installed
-            To upgrade to #{f.version}, run `brew upgrade #{f.name}`
+            To upgrade to #{f.version}, run `brew upgrade #{f.full_name}`
           EOS
         elsif args.only_dependencies?
           formulae << f
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 509a0d82f4..d7fba9fd98 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -228,7 +228,7 @@ class FormulaInstaller
       EOS
       if formula.outdated? && !formula.head?
         message += <<~EOS
-          To upgrade to #{formula.pkg_version}, run `brew upgrade #{formula.name}`.
+          To upgrade to #{formula.pkg_version}, run `brew upgrade #{formula.full_name}`.
         EOS
       elsif only_deps?
         message = nil