diff --git a/modules/bases/windows_server_2008_r2_amd64/Packerfile.erb b/modules/bases/windows_server_2008_r2_amd64/Packerfile.erb
index d01d790b8..686bc1b2a 100644
--- a/modules/bases/windows_server_2008_r2_amd64/Packerfile.erb
+++ b/modules/bases/windows_server_2008_r2_amd64/Packerfile.erb
@@ -6,7 +6,7 @@
 <%= if (@options.has_key? :memory_per_vm)
       "[ \"modifyvm\", \"{{.Name}}\", \"--memory\", \"#{@options[:memory_per_vm]}\" ],"
     elsif (@options.has_key? :total_memory)
-      "[ \"modifyvm\", \"{{.Name}}\", \"--memory\", \"#{@options[:total_memory]/@systems.length}\" ],"
+      "[ \"modifyvm\", \"{{.Name}}\", \"--memory\", \"#{@options[:total_memory].to_i/@systems.length}\" ],"
     end %>
 <%= if (@options.has_key? :max_cpu_cores)
       "[ \"modifyvm\", \"{{.Name}}\", \"--cpus\", \"#{@options[:max_cpu_cores]}\" ],"