diff --git a/lib/terminal-table/cell.rb b/lib/terminal-table/cell.rb
index 831fabb..0ac9b06 100644
--- a/lib/terminal-table/cell.rb
+++ b/lib/terminal-table/cell.rb
@@ -1,3 +1,5 @@
+require 'unicode/display_width'
+
 module Terminal
   class Table
     class Cell
@@ -55,7 +57,8 @@ def lines
       def render(line = 0)
         left = " " * @table.style.padding_left
         right = " " * @table.style.padding_right
-        render_width = lines[line].to_s.size - escape(lines[line]).size + width
+        display_width = Unicode::DisplayWidth.of(escape(lines[line]))
+        render_width = lines[line].to_s.size - display_width + width
         align("#{left}#{lines[line]}#{right}", alignment, render_width + @table.cell_padding)
       end
       alias :to_s :render
@@ -65,7 +68,7 @@ def render(line = 0)
       # removes all ANSI escape sequences (e.g. color)
 
       def value_for_column_width_recalc
-        lines.map{ |s| escape(s) }.max_by{ |s| s.size }
+        lines.map{ |s| escape(s) }.max_by{ |s| Unicode::DisplayWidth.of(s) }
       end
 
       ##
diff --git a/lib/terminal-table/table.rb b/lib/terminal-table/table.rb
index 8deff1c..458bac3 100755
--- a/lib/terminal-table/table.rb
+++ b/lib/terminal-table/table.rb
@@ -1,3 +1,5 @@
+require 'unicode/display_width'
+
 module Terminal
   class Table
 
@@ -200,7 +202,7 @@ def recalc_column_widths row
         colspan = cell.colspan
         cell_value = cell.value_for_column_width_recalc
         colspan.downto(1) do |j|
-          cell_length = cell_value.to_s.length
+          cell_length = Unicode::DisplayWidth.of(cell_value.to_s)
           if colspan > 1
             spacing_length = cell_spacing * (colspan - 1)
             length_in_columns = (cell_length - spacing_length)
diff --git a/spec/table_spec.rb b/spec/table_spec.rb
index aca36d7..5c93da6 100755
--- a/spec/table_spec.rb
+++ b/spec/table_spec.rb
@@ -591,5 +591,18 @@ module Terminal
       EOF
     end
 
+    it "should render a table with fullwidth characters" do
+      @table.headings = ['COL 1', 'ＣＯＬ ２', 'COL ３', 'ＣＯＬ４']
+      @table << ['中文', 'にっぽんご', '한국어', 'ＡＢＣ']
+      @table << ['Chinese','Japanese','Korean', '.......']
+      @table.render.should == <<-EOF.deindent
+        +---------+------------+--------+----------+
+        | COL 1   | ＣＯＬ ２  | COL ３ | ＣＯＬ４ |
+        +---------+------------+--------+----------+
+        | 中文    | にっぽんご | 한국어 | ＡＢＣ   |
+        | Chinese | Japanese   | Korean | .......  |
+        +---------+------------+--------+----------+
+      EOF
+    end
   end
 end
diff --git a/terminal-table.gemspec b/terminal-table.gemspec
index 6fc6c69..2a4c923 100644
--- a/terminal-table.gemspec
+++ b/terminal-table.gemspec
@@ -21,4 +21,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rspec", ">= 3.0"
   spec.add_development_dependency "term-ansicolor"
   spec.add_development_dependency "pry"
+
+  spec.add_runtime_dependency "unicode-display_width", "~> 1.1"
 end