diff --git a/pywb/rewrite/regex_rewriters.py b/pywb/rewrite/regex_rewriters.py
index b0011d61..c2359c1e 100644
--- a/pywb/rewrite/regex_rewriters.py
+++ b/pywb/rewrite/regex_rewriters.py
@@ -128,7 +128,7 @@ class JSLinkAndLocationRewriter(JSLinkOnlyRewriter):
              (r'(?<=document\.)referrer', RegexRewriter.add_prefix(prefix), 0),
 
             #todo: move to mixin?
-             (r'(?:[\s=()]|^)(top)(?:[\s!=()]|$)',
+             (r'(?:[\s=(){]|^)(top)(?:[\s!=}()]|$)',
               RegexRewriter.add_prefix(prefix), 1),
 
              (r'(?<=window\.)top',
diff --git a/pywb/rewrite/test/test_rewrite_live.py b/pywb/rewrite/test/test_rewrite_live.py
index 3caef706..1b2faacc 100644
--- a/pywb/rewrite/test/test_rewrite_live.py
+++ b/pywb/rewrite/test/test_rewrite_live.py
@@ -82,6 +82,10 @@ def test_example_domain_specific_3():
     # comment out bootloader
     assert '/* Bootloader.configurePage' in buff
 
+def test_wombat_top():
+    status_headers, buff = get_rewritten('https://assets-cdn.github.com/assets/github-0f06d0f46fe7bcfbf31f2380f23aec15ba21b8ec.js', urlrewriter)
+
+    assert 'WB_wombat_top!==window' in buff
 
 def test_post():
     buff = BytesIO('ABC=DEF')