diff --git a/Library/Homebrew/utils.rb b/Library/Homebrew/utils.rb
index fa2f430e3d..ede63b5f6b 100644
--- a/Library/Homebrew/utils.rb
+++ b/Library/Homebrew/utils.rb
@@ -212,7 +212,7 @@ end
 def safe_exec cmd, *args
   # This buys us proper argument quoting and evaluation
   # of environment variables in the cmd parameter.
-  exec "/bin/sh", "-i", "-c", cmd + ' "$@"', "--", *args
+  exec "/bin/sh", "-c", "#{cmd} \"$@\"", "--", *args
 end
 
 # GZips the given paths, and returns the gzipped paths