diff --git a/CHANGES b/CHANGES
index ad51ffeff..0e06938df 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,6 +1,9 @@
 Release 1.0.2 (in development)
 ==============================
 
+* Fix unwanted styling of C domain references (because of a
+  namespace clash with Pygments styles).
+
 * Allow references to PEPs and RFCs with explicit anchors.
 
 * #471: Fix LaTeX references to figures.
diff --git a/sphinx/highlighting.py b/sphinx/highlighting.py
index f5ea859cb..0dcbc0219 100644
--- a/sphinx/highlighting.py
+++ b/sphinx/highlighting.py
@@ -240,7 +240,7 @@ class PygmentsBridge(object):
             # no HTML styles needed
             return ''
         if self.dest == 'html':
-            return self.fmter[0].get_style_defs()
+            return self.fmter[0].get_style_defs('.highlight')
         else:
             styledefs = self.fmter[0].get_style_defs()
             # workaround for Pygments < 0.12