diff --git a/lib/SVG/Graph/Schedule.rb b/lib/SVG/Graph/Schedule.rb
index 2f4b6b2..70e13b3 100644
--- a/lib/SVG/Graph/Schedule.rb
+++ b/lib/SVG/Graph/Schedule.rb
@@ -1,5 +1,5 @@
 require 'SVG/Graph/Plot'
-TIME_PARSE_AVAIL = (RUBY_VERSION =~ /1\.9\./) ? true : false
+TIME_PARSE_AVAIL = (RUBY_VERSION =~ /1\.8\./) ? false : true
 if not TIME_PARSE_AVAIL then
   require 'parsedate'
 end
diff --git a/lib/SVG/Graph/TimeSeries.rb b/lib/SVG/Graph/TimeSeries.rb
index 2d0b439..4a573a4 100644
--- a/lib/SVG/Graph/TimeSeries.rb
+++ b/lib/SVG/Graph/TimeSeries.rb
@@ -1,5 +1,5 @@
 require 'SVG/Graph/Plot'
-TIME_PARSE_AVAIL = (RUBY_VERSION =~ /1\.9\./) ? true : false
+TIME_PARSE_AVAIL = (RUBY_VERSION =~ /1\.8\./) ? false : true
 if not TIME_PARSE_AVAIL then
   require 'parsedate'
 end