diff --git a/samples/liblinear/wscript b/samples/liblinear/wscript
index 19af4df..3da89c5 100644
--- a/samples/liblinear/wscript
+++ b/samples/liblinear/wscript
@@ -10,7 +10,7 @@ def build(bld):
     pass  # for enabling waf-clean
 
 @maflib.plot.plot_by
-def plot(figure, data):
+def plot(figure, data, parameter):
     """Plot figure for LIBLINEAR experiment."""
 
     LIBLINEAR_METHODS = {
@@ -45,17 +45,10 @@ def experiment(exp):
     # Download and decompress 20 newsgroup dataset from LIBSVM webiste.
     website = 'http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multiclass/'
 
-    exp(target='news20.scale.bz2',
-        rule='wget %s/news20.scale.bz2 -O ${TGT}' % website)
-    exp(source='news20.scale.bz2',
-        target='news20.scale',
-        rule='bunzip2 ${SRC} --keep')
-
-    exp(target='news20.t.scale.bz2',
-        rule='wget %s/news20.t.scale.bz2 -O ${TGT}' % website)
-    exp(source='news20.t.scale.bz2',
-        target='news20.t.scale',
-        rule='bunzip2 ${SRC} --keep')
+    exp(target='news20.scale',
+        rule=maflib.rules.download(website+'/news20.scale.bz2', 'bz2'))
+    exp(target='news20.t.scale',
+        rule=maflib.rules.download(website+'/news20.t.scale.bz2', 'bz2'))
 
     # Train with various parameters.
     exp(source='news20.scale',