diff --git a/cfg/std.cfg b/cfg/std.cfg
index a01937334..833bd328c 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -7937,6 +7937,30 @@ initializer list (7) string& replace (const_iterator i1, const_iterator i2, init
     <leak-ignore/>
     <const/>
   </function>
+  <!-- unsigned long long std::bitset::to_ullong() const ; (since C++11) -->
+  <function name="std::bitset::to_ullong">
+    <noreturn>false</noreturn>
+    <use-retval/>
+    <returnValue type="unsigned long long"/>
+    <leak-ignore/>
+    <const/>
+  </function>
+  <!-- unsigned long std::bitset::to_ulong() const ; -->
+  <function name="std::bitset::to_ulong">
+    <noreturn>false</noreturn>
+    <use-retval/>
+    <returnValue type="unsigned long"/>
+    <leak-ignore/>
+    <const/>
+  </function>
+  <!-- std::string std::bitset::to_string() const ; -->
+  <function name="std::bitset::to_string">
+    <noreturn>false</noreturn>
+    <use-retval/>
+    <returnValue type="std::string"/>
+    <leak-ignore/>
+    <const/>
+  </function>
   <!-- bool std::bitset< N >::test( std::size_t pos ) const -->
   <function name="std::bitset::test">
     <noreturn>false</noreturn>