diff --git a/examples/CMakeFiles/simple_ex1.dir/simple_ex1.cc.o b/examples/CMakeFiles/simple_ex1.dir/simple_ex1.cc.o
deleted file mode 100644
index 981c1e9..0000000
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diff --git a/examples/simple_ex1 b/examples/simple_ex1
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diff --git a/include/jwt/jwt.hpp b/include/jwt/jwt.hpp
index 0970705..4247d2e 100644
--- a/include/jwt/jwt.hpp
+++ b/include/jwt/jwt.hpp
@@ -660,7 +660,7 @@ public: // Exposed APIs
   //based overload
   bool has_claim(const jwt::string_view cname) const noexcept
   {
-    return claim_names_.count(cname);
+    return claim_names_.find(cname) != std::end(claim_names_);
   }
 
   /**
diff --git a/tests/test_jwt_encode b/tests/test_jwt_encode
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