diff --git a/plugins/kernel_v2/config/vm.rb b/plugins/kernel_v2/config/vm.rb
index 38c570cd1..c650ddc59 100644
--- a/plugins/kernel_v2/config/vm.rb
+++ b/plugins/kernel_v2/config/vm.rb
@@ -128,7 +128,7 @@ module VagrantPlugins
         if Vagrant::Util::Platform.windows?
           # On Windows, Ruby just uses normal '/' for path seps, so
           # just replace normal Windows style seps with Unix ones.
-          hostpath = hostpath.to_s.gsub!("\\", "/")
+          hostpath = hostpath.to_s.gsub("\\", "/")
         end
 
         options ||= {}