diff --git a/app/models/tag.rb b/app/models/tag.rb
index ed8cd9d2e..780c9b700 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -320,7 +320,10 @@ class Tag < ActiveRecord::Base
 
     def parse_helper_fudged(range, type)
       result = parse_helper(range, type)
-      if result[0] == :eq
+      # Don't fudge the filesize when searching filesize:123b or filesize:123.
+      if result[0] == :eq && type == :filesize && range !~ /[km]b?\Z/i
+        result
+      elsif result[0] == :eq
         new_min = (result[1] * 0.95).to_i
         new_max = (result[1] * 1.05).to_i
         [:between, new_min, new_max]
diff --git a/test/unit/post_test.rb b/test/unit/post_test.rb
index 5124b9998..b70e0417d 100644
--- a/test/unit/post_test.rb
+++ b/test/unit/post_test.rb
@@ -1328,6 +1328,19 @@ class PostTest < ActiveSupport::TestCase
       assert_equal(post3.id, relation.first.id)
     end
 
+    should "return posts for a filesize search" do
+      post = FactoryGirl.create(:post, :file_size => 1.megabyte)
+      assert_equal(1, Post.tag_match("filesize:1mb").count)
+      assert_equal(1, Post.tag_match("filesize:1000kb").count)
+      assert_equal(1, Post.tag_match("filesize:1048576b").count)
+    end
+
+    should "not perform fuzzy matching for an exact filesize search" do
+      post = FactoryGirl.create(:post, :file_size => 1.megabyte)
+      assert_equal(0, Post.tag_match("filesize:1048000b").count)
+      assert_equal(0, Post.tag_match("filesize:1048000").count)
+    end
+
     should "fail for more than 6 tags" do
       post1 = FactoryGirl.create(:post, :rating => "s")