diff --git a/test/dtrace/helper.rb b/test/dtrace/helper.rb
index 22865aac25..1417185537 100644
--- a/test/dtrace/helper.rb
+++ b/test/dtrace/helper.rb
@@ -32,7 +32,7 @@ module DTrace
     when /darwin/i
       READ_PROBES = proc do |cmd|
         PTY.spawn(*cmd) do |io, _|
-          break io.readlines
+          break io.readlines.each {|line| line.sub!(/\r$/, "")}
         end
       end
     end
diff --git a/test/dtrace/test_method_cache.rb b/test/dtrace/test_method_cache.rb
index 7ecec194b2..a101b5ddec 100644
--- a/test/dtrace/test_method_cache.rb
+++ b/test/dtrace/test_method_cache.rb
@@ -9,9 +9,9 @@ module DTrace
         class String; def abc() end end
         class Object; def abc() end end
       code
-        assert_not_includes lines, "String #{rbfile} 1\n"
-        assert_includes     lines, "String #{rbfile} 2\n"
-        assert_includes     lines, "global #{rbfile} 3\n"
+        assert_not_include lines, "String #{rbfile} 1\n"
+        assert_include     lines, "String #{rbfile} 2\n"
+        assert_include     lines, "global #{rbfile} 3\n"
       end
     end