diff --git a/lib/vagrant/config/loader.rb b/lib/vagrant/config/loader.rb
index 64d4f404a..7588d7751 100644
--- a/lib/vagrant/config/loader.rb
+++ b/lib/vagrant/config/loader.rb
@@ -129,7 +129,7 @@ module Vagrant
                 path = "(unknown)"
                 if e.backtrace && e.backtrace[0]
                   backtrace_tokens = e.backtrace[0].split(":")
-                  path = backtrace_tokens[0]
+                  path = e.backtrace.first.slice(0, e.backtrace.first.rindex(':')).rpartition(':').first
                   backtrace_tokens.each do |part|
                     if part =~ /\d+/
                       line = part.to_i
diff --git a/plugins/kernel_v2/config/vm.rb b/plugins/kernel_v2/config/vm.rb
index 3169b0552..6339d3e4b 100644
--- a/plugins/kernel_v2/config/vm.rb
+++ b/plugins/kernel_v2/config/vm.rb
@@ -509,7 +509,7 @@ module VagrantPlugins
 
             line = "(unknown)"
             if e.backtrace && e.backtrace[0]
-              line = e.backtrace[0].split(":")[1]
+              line = e.backtrace.first.slice(0, e.backtrace.first.rindex(':')).rpartition(':').last
             end
 
             raise Vagrant::Errors::VagrantfileLoadError,