diff --git a/heat/engine/hot.py b/heat/engine/hot.py
index f3755d2eda..3599fa0e5e 100644
--- a/heat/engine/hot.py
+++ b/heat/engine/hot.py
@@ -248,7 +248,7 @@ class HOTemplate(template.Template):
                     _('"params" parameter must be a dictionary'))
             for key in params.iterkeys():
                 value = params.get(key, '') or ""
-                text = text.replace(key, value)
+                text = text.replace(key, str(value))
             return text
 
         match_str_replace = lambda k, v: k in ['str_replace', 'Fn::Replace']
diff --git a/heat/tests/test_hot.py b/heat/tests/test_hot.py
index 401c0fa1f9..0919f320cf 100644
--- a/heat/tests/test_hot.py
+++ b/heat/tests/test_hot.py
@@ -177,6 +177,18 @@ class HOTemplateTest(HeatTestCase):
         self.assertEqual(snippet_resolved,
                          tmpl.resolve_replace(snippet))
 
+    def test_str_replace_number(self):
+        """Test str_replace function with numbers."""
+
+        snippet = {'str_replace': {'template': 'Template number string bar',
+                                   'params': {'number': 1}}}
+        snippet_resolved = 'Template 1 string bar'
+
+        tmpl = parser.Template(hot_tpl_empty)
+
+        self.assertEqual(snippet_resolved,
+                         tmpl.resolve_replace(snippet))
+
     def test_str_fn_replace(self):
         """Test Fn:Replace function."""