diff --git a/cfg/wxwidgets.cfg b/cfg/wxwidgets.cfg
index 053998d0a..04cf93862 100644
--- a/cfg/wxwidgets.cfg
+++ b/cfg/wxwidgets.cfg
@@ -7727,4 +7727,31 @@
       <not-null/>
     </arg>
   </function>
+  <!-- bool wxIsupper( const wxUniChar & c ) -->
+  <!-- bool wxIsxdigit( const wxUniChar & c ) -->
+  <!-- bool wxIsspace( const wxUniChar & c ) -->
+  <!-- bool wxIspunct( const wxUniChar & c ) -->
+  <!-- bool wxIsprint( const wxUniChar & c ) -->
+  <!-- bool wxIslower( const wxUniChar & c ) -->
+  <!-- bool wxIsgraph( const wxUniChar & c ) -->
+  <!-- bool wxIsdigit( const wxUniChar & c ) -->
+  <!-- bool wxIscntrl( const wxUniChar & c ) -->
+  <!-- bool wxIsascii( const wxUniChar & c ) -->
+  <!-- bool wxIsalpha( const wxUniChar & c ) -->
+  <!-- bool wxIsalnum( const wxUniChar & c ) -->
+  <function name="wxIsupper,wxIsxdigit,wxIsspace,wxIspunct,wxIsprint,wxIslower,wxIsgraph,wxIsdigit,wxIsctrl,wxIscntrl,wxIsascii,wxIsalpha,wxIsalnum">
+    <use-retval/>
+    <leak-ignore/>
+    <noreturn>false</noreturn>
+    <returnValue type="bool"/>
+    <arg nr="1"/>
+  </function>
+  <!-- int wxIsctrl( const wxUniChar & c ) -->
+  <function name="wxIsctrl">
+    <use-retval/>
+    <leak-ignore/>
+    <noreturn>false</noreturn>
+    <returnValue type="int"/>
+    <arg nr="1"/>
+  </function>
 </def>