diff --git a/include/boost/geometry/algorithms/detail/is_valid/has_spikes.hpp b/include/boost/geometry/algorithms/detail/is_valid/has_spikes.hpp
index 703fdbace..090c026e8 100644
--- a/include/boost/geometry/algorithms/detail/is_valid/has_spikes.hpp
+++ b/include/boost/geometry/algorithms/detail/is_valid/has_spikes.hpp
@@ -67,7 +67,7 @@ struct not_equal_to
     template <typename OtherPoint>
     inline bool operator()(OtherPoint const& other) const
     {
-        return !geometry::equals(other, m_point);
+        return ! geometry::equals(other, m_point);
     }
 };