diff --git a/lib/youplot/parser.rb b/lib/youplot/parser.rb
index e9e1810..c073828 100644
--- a/lib/youplot/parser.rb
+++ b/lib/youplot/parser.rb
@@ -58,10 +58,10 @@ module YouPlot
         parser.on('-t', '--title STR', String, 'print string on the top of plot') do |v|
           params.title = v
         end
-        parser.on('-x', '--xlabel STR', String, 'print string on the bottom of the plot') do |v|
+        parser.on('--xlabel STR', String, 'print string on the bottom of the plot') do |v|
           params.xlabel = v
         end
-        parser.on('-y', '--ylabel STR', String, 'print string on the far left of the plot') do |v|
+        parser.on('--ylabel STR', String, 'print string on the far left of the plot') do |v|
           params.ylabel = v
         end
         parser.on('-w', '--width INT', Numeric, 'number of characters per row') do |v|
diff --git a/test/youplot/simple_test.rb b/test/youplot/simple_test.rb
index 7856ab3..66a2556 100644
--- a/test/youplot/simple_test.rb
+++ b/test/youplot/simple_test.rb
@@ -155,21 +155,11 @@ class YouPlotSimpleTest < Test::Unit::TestCase
     assert_equal fixture('simple-lineplot-xlabel.txt'), @stderr_file.read
   end
 
-  test :line_x do
-    YouPlot::Command.new(['line', '-x', 'X-LABEL']).run
-    assert_equal fixture('simple-lineplot-xlabel.txt'), @stderr_file.read
-  end
-
   test :line_ylabel do
     YouPlot::Command.new(['line', '--ylabel', 'Y-LABEL']).run
     assert_equal fixture('simple-lineplot-ylabel.txt'), @stderr_file.read
   end
 
-  test :line_y do
-    YouPlot::Command.new(['line', '-y', 'Y-LABEL']).run
-    assert_equal fixture('simple-lineplot-ylabel.txt'), @stderr_file.read
-  end
-
   test :line_width do
     YouPlot::Command.new(['line', '--width', '17']).run
     assert_equal fixture('simple-lineplot-width-17.txt'), @stderr_file.read