diff --git a/lib/oga/xpath/conversion.rb b/lib/oga/xpath/conversion.rb
index 1146427..c3709cc 100644
--- a/lib/oga/xpath/conversion.rb
+++ b/lib/oga/xpath/conversion.rb
@@ -63,7 +63,13 @@ module Oga
           value = value.text
         end
 
-        Float(value) rescue Float::NAN
+        if value == true
+          1.0
+        elsif value == false
+          0.0
+        else
+          Float(value) rescue Float::NAN
+        end
       end
 
       # @return [TrueClass|FalseClass]
diff --git a/spec/oga/xpath/conversion_spec.rb b/spec/oga/xpath/conversion_spec.rb
index 6737b62..2b0ad5a 100644
--- a/spec/oga/xpath/conversion_spec.rb
+++ b/spec/oga/xpath/conversion_spec.rb
@@ -182,6 +182,18 @@ describe Oga::XPath::Conversion do
         described_class.to_float(nil).should be_nan
       end
     end
+
+    describe 'using a TrueClass' do
+      it 'returns 1.0' do
+        described_class.to_float(true).should == 1.0
+      end
+    end
+
+    describe 'using a FalseClass' do
+      it 'returns 0.0' do
+        described_class.to_float(false).should == 0.0
+      end
+    end
   end
 
   describe 'to_boolean' do