diff --git a/Gemfile b/Gemfile
index ffc3514a198fd4290ccf2eea1291844983aa2227..a2386770992b5fd774f6e398b94c25765798be11 100644
--- a/Gemfile
+++ b/Gemfile
@@ -349,4 +349,3 @@ gem 'health_check', '~> 1.5.1'
 
 # System information
 gem 'vmstat', '~> 2.1.0'
-gem 'filesize', '~> 0.1.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index afc1dce1710f3a01291384bedeb3740b95fb15d3..c1d2f1fdf5a129e4dc90ede0b840b41c964bc17e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -207,7 +207,6 @@ GEM
       multi_json
     ffaker (2.0.0)
     ffi (1.9.10)
-    filesize (0.1.1)
     flay (2.6.1)
       ruby_parser (~> 3.0)
       sexp_processor (~> 4.0)
@@ -851,7 +850,6 @@ DEPENDENCIES
   email_spec (~> 1.6.0)
   factory_girl_rails (~> 4.6.0)
   ffaker (~> 2.0.0)
-  filesize (~> 0.1.1)
   flay
   flog
   fog-aws (~> 0.9)
diff --git a/app/controllers/admin/system_info_controller.rb b/app/controllers/admin/system_info_controller.rb
index ab05ed2612a759aae502796c40fd5d77445415b2..b7333139c57a8dc3f37e973640a6ab0a505a6f9d 100644
--- a/app/controllers/admin/system_info_controller.rb
+++ b/app/controllers/admin/system_info_controller.rb
@@ -3,10 +3,10 @@ class Admin::SystemInfoController < Admin::ApplicationController
     system_info = Vmstat.snapshot
     @load = system_info.load_average.collect { |v| v.round(2) }.join(', ')
 
-    @mem_used = Filesize.from("#{system_info.memory.active_bytes} B").to_f('GB').round
-    @mem_total = Filesize.from("#{system_info.memory.total_bytes} B").to_f('GB').round
+    @mem_used = system_info.memory.active_bytes
+    @mem_total = system_info.memory.total_bytes
 
-    @disk_used = Filesize.from("#{system_info.disks[0].used_bytes} B").to_f('GB').round
-    @disk_total = Filesize.from("#{system_info.disks[0].total_bytes} B").to_f('GB').round
+    @disk_used = system_info.disks[0].used_bytes
+    @disk_total = system_info.disks[0].total_bytes
   end
 end
diff --git a/app/views/admin/system_info/show.html.haml b/app/views/admin/system_info/show.html.haml
index 316a94f4d4166eae2601a4aef0f2e50a3baf8936..542498cfb22982f022ff364b943bb86a7cf72a4c 100644
--- a/app/views/admin/system_info/show.html.haml
+++ b/app/views/admin/system_info/show.html.haml
@@ -14,9 +14,9 @@
       .light-well
         %h4 Memory
         .data
-          %h1= "#{@mem_used}GB / #{@mem_total}GB"
+          %h1= "#{number_to_human_size(@mem_used)} / #{number_to_human_size(@mem_total)}"
     .col-sm-4
       .light-well
         %h4 Disk
         .data
-          %h1= "#{@disk_used}GB / #{@disk_total}GB"
+          %h1= "#{number_to_human_size(@disk_used)} / #{number_to_human_size(@disk_total)}"
diff --git a/app/views/layouts/nav/_admin.html.haml b/app/views/layouts/nav/_admin.html.haml
index e6c5ec06252a75fd48b976338911fef62ebe0b86..5ee8772882ec68a9e31a00c7c06344cc79da6865 100644
--- a/app/views/layouts/nav/_admin.html.haml
+++ b/app/views/layouts/nav/_admin.html.haml
@@ -10,7 +10,7 @@
         %span
           Overview
     = nav_link(controller: %w(system_info background_jobs logs health_check)) do
-      = link_to admin_background_jobs_path, title: 'Monitoring' do
+      = link_to admin_system_info_path, title: 'Monitoring' do
         %span
           Monitoring
     = nav_link(controller: :broadcast_messages) do