diff --git a/Library/Homebrew/install.rb b/Library/Homebrew/install.rb
index a75ef25832..4b4dea724b 100644
--- a/Library/Homebrew/install.rb
+++ b/Library/Homebrew/install.rb
@@ -299,6 +299,7 @@ module Homebrew
           fi
         rescue CannotInstallFormulaError => e
           ofail e.message
+          nil
         rescue UnsatisfiedRequirements, DownloadError, ChecksumMismatchError => e
           ofail "#{f}: #{e}"
           nil
diff --git a/Library/Homebrew/upgrade.rb b/Library/Homebrew/upgrade.rb
index 1d594e2df5..a8073ff57f 100644
--- a/Library/Homebrew/upgrade.rb
+++ b/Library/Homebrew/upgrade.rb
@@ -73,6 +73,7 @@ module Homebrew
           fi
         rescue CannotInstallFormulaError => e
           ofail e
+          nil
         rescue UnsatisfiedRequirements, DownloadError => e
           ofail "#{formula}: #{e}"
           nil