diff --git a/src/cli/openstudio_cli.rb b/src/cli/openstudio_cli.rb
index 304043a734d..33903738651 100644
--- a/src/cli/openstudio_cli.rb
+++ b/src/cli/openstudio_cli.rb
@@ -293,6 +293,14 @@ def split_main_and_subcommand(argv, command_list)
 # parse the main args, those that come before the sub command
 def parse_main_args(main_args)
 
+  # Unset RUBY ENVs if previously set (e.g. rvm sets these in shell) 
+
+  ENV.delete('GEM_HOME') if ENV['GEM_HOME']
+  ENV.delete('GEM_PATH') if ENV['GEM_PATH']
+  ENV.delete('BUNDLE_GEMFILE') if ENV['BUNDLE_GEMFILE']
+  ENV.delete('BUNDLE_PATH') if ENV['BUNDLE_PATH']
+  ENV.delete('BUNDLE_WITHOUT') if ENV['BUNDLE_WITHOUT']
+
   $logger.debug "Parsing main_args #{main_args}"
 
   # verbose already handled
@@ -361,9 +369,6 @@ def parse_main_args(main_args)
   remove_indices.reverse_each {|i| main_args.delete_at(i)}
 
   if !new_path.empty?
-    if ENV['GEM_PATH']
-      new_path << ENV['GEM_PATH'].to_s
-    end
 
     new_path = new_path.join(File::PATH_SEPARATOR)
 
@@ -396,11 +401,6 @@ def parse_main_args(main_args)
     ENV['BUNDLE_GEMFILE'] = gemfile
     use_bundler = true
 
-  elsif ENV['BUNDLE_GEMFILE']
-    # no argument but env var is set
-    $logger.info "ENV['BUNDLE_GEMFILE'] set to '#{ENV['BUNDLE_GEMFILE']}'"
-    use_bundler = true
-
   end
 
   if main_args.include? '--bundle_path'
@@ -413,10 +413,6 @@ def parse_main_args(main_args)
     $logger.info "Setting BUNDLE_PATH to #{bundle_path}"
     ENV['BUNDLE_PATH'] = bundle_path
 
-  elsif ENV['BUNDLE_PATH']
-    # no argument but env var is set
-    $logger.info "ENV['BUNDLE_PATH'] set to '#{ENV['BUNDLE_PATH']}'"
-
   elsif use_bundler
     # bundle was requested but bundle_path was not provided
     $logger.warn "Bundle activated but ENV['BUNDLE_PATH'] is not set"
@@ -436,10 +432,6 @@ def parse_main_args(main_args)
     $logger.info "Setting BUNDLE_WITHOUT to #{bundle_without}"
     ENV['BUNDLE_WITHOUT'] = bundle_without
 
-  elsif ENV['BUNDLE_WITHOUT']
-    # no argument but env var is set
-    $logger.info "ENV['BUNDLE_WITHOUT'] set to '#{ENV['BUNDLE_WITHOUT']}'"
-
   elsif use_bundler
     # bundle was requested but bundle_path was not provided
     $logger.info "Bundle activated but ENV['BUNDLE_WITHOUT'] is not set"