diff --git a/spec/public/matchers/contain_spec.rb b/spec/public/matchers/contain_spec.rb
index 1157ba6..e0677ac 100644
--- a/spec/public/matchers/contain_spec.rb
+++ b/spec/public/matchers/contain_spec.rb
@@ -56,13 +56,13 @@ describe "contain" do
       it "should throw an exception when the body doesnt contain the text" do
         lambda {
           assert_contain("monkeys")
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
 
       it "should throw an exception when the body doesnt contain the regexp" do
         lambda {
           assert_contain(/monkeys/)
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
     end
 
@@ -78,13 +78,13 @@ describe "contain" do
       it "should throw an exception when the body does contain the text" do
         lambda {
           assert_not_contain("hello, world")
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
 
       it "should throw an exception when the body does contain the regexp" do
         lambda {
           assert_not_contain(/hello, world/)
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
     end
   end
diff --git a/spec/public/matchers/have_selector_spec.rb b/spec/public/matchers/have_selector_spec.rb
index d7008a9..79e9e74 100644
--- a/spec/public/matchers/have_selector_spec.rb
+++ b/spec/public/matchers/have_selector_spec.rb
@@ -122,7 +122,7 @@ describe "have_selector" do
       it "should throw an exception when the body doesnt have matching selection" do
         lambda {
           assert_have_selector("p")
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
     end
 
@@ -134,7 +134,7 @@ describe "have_selector" do
       it "should throw an exception when the body does contain the selection" do
         lambda {
           assert_have_no_selector("div")
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
     end
   end
diff --git a/spec/public/matchers/have_xpath_spec.rb b/spec/public/matchers/have_xpath_spec.rb
index 1f6b481..e1c880e 100644
--- a/spec/public/matchers/have_xpath_spec.rb
+++ b/spec/public/matchers/have_xpath_spec.rb
@@ -117,7 +117,7 @@ describe "have_xpath" do
       it "should throw an exception when the body doesnt have matching xpath" do
         lambda {
           assert_have_xpath("//p")
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
     end
 
@@ -129,7 +129,7 @@ describe "have_xpath" do
       it "should throw an exception when the body does contain the xpath" do
         lambda {
           assert_have_no_xpath("//div")
-        }.should raise_error(Test::Unit::AssertionFailedError)
+        }.should raise_error(AssertionFailedError)
       end
     end
   end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 084ff85..a64e39d 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -8,6 +8,8 @@ begin require "redgreen" unless ENV['TM_CURRENT_LINE']; rescue LoadError; end
 webrat_path = File.expand_path(File.dirname(__FILE__) + "/../lib/")
 $LOAD_PATH.unshift(webrat_path) unless $LOAD_PATH.include?(webrat_path)
 
+AssertionFailedError = Test::Unit::AssertionFailedError rescue MiniTest::Assertion # ruby1.9 compat
+
 require "webrat"
 require File.expand_path(File.dirname(__FILE__) + "/fakes/test_session")