diff --git a/cfg/cppcheck-cfg.rng b/cfg/cppcheck-cfg.rng
index 5dd446c1778..49dae39b483 100644
--- a/cfg/cppcheck-cfg.rng
+++ b/cfg/cppcheck-cfg.rng
@@ -122,7 +122,7 @@
                 </attribute>
               </optional>
               <empty/>
-            </element>            
+            </element>
           </optional>
           <optional>
             <element name="pure"><empty/></element>
@@ -573,7 +573,7 @@
                 </element>
               </choice>
             </zeroOrMore>
-          </element>          
+          </element>
         </optional>
       </element>
 
@@ -651,7 +651,7 @@
       <param name="maxInclusive">2</param>
     </data>
   </define>
-  
+
   <define name="ARG-DIRECTION">
     <choice>
       <value>in</value>
@@ -720,7 +720,7 @@
       <value>empty</value>
     </choice>
   </define>
-  
+
   <define name="MINSIZE-VALUE">
     <data type="unsignedLong">
       <param name="minInclusive">1</param>
diff --git a/cfg/std.cfg b/cfg/std.cfg
index 64ee508e69e..a8e08a4ac31 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -68,6 +68,13 @@
   <function name="abort,std::abort,std::terminate">
     <noreturn>true</noreturn>
   </function>
+  <!--              void unexpected(); (until C++11)          -->
+  <!-- [[noreturn]] void unexpected(); (since C++11)          --> 
+  <!-- (deprecated)(removed in C++17)                         -->
+  <function name="std::unexpected">
+    <noreturn>true</noreturn>
+    <warn severity="style" alternatives="std::terminate" reason="Obsolete"/>
+  </function>
   <!-- int abs(int j); -->
   <function name="abs,std::abs">
     <use-retval/>
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 66eeb6598eb..11efa81f5d3 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -58,6 +58,16 @@
 #include <span>
 #endif
 
+#if __cplusplus <= 201402L
+void unreachableCode_std_unexpected(int &x)
+{
+    // cppcheck-suppress unexpectedCalled
+    std::unexpected();
+    // cppcheck-suppress unreachableCode
+    x=42;
+}
+#endif
+
 void unreachableCode_std_terminate(int &x)
 {
     std::terminate();