diff --git a/README.rst b/README.rst
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@@ -6,6 +6,7 @@ C++ Format
 
 .. image:: https://ci.appveyor.com/api/projects/status/qk0bhyhqp1ekpat8
   :target: https://ci.appveyor.com/project/vitaut/cppformat
+  :height: 18px
 
 C++ Format is an open-source formatting library for C++.
 It can be used as a type-safe alternative to printf or as a fast