diff --git a/setup.py b/setup.py
index cdcaacc..2f33173 100755
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,8 @@ def get_packages():
     return packages
 
 requirements = [
-          'misaka',
+    'misaka',
+    'sure'
 ]
 
 setup(name='steadymark',
diff --git a/steadymark/core.py b/steadymark/core.py
index 4aa2f56..1d366c9 100644
--- a/steadymark/core.py
+++ b/steadymark/core.py
@@ -91,10 +91,12 @@ class MarkdownTest(object):
 
         is_doctest = isinstance(self.code, DocTest)
         try:
+            import sure
             if is_doctest:
                 result = self._run_doctest()
             else:
                 result = self._run_raw()
+            sure
 
         except:
             failure = sys.exc_info()