diff --git a/cfg/wxwidgets.cfg b/cfg/wxwidgets.cfg
index 7aae3d8df..289c39f4b 100644
--- a/cfg/wxwidgets.cfg
+++ b/cfg/wxwidgets.cfg
@@ -18,6 +18,7 @@
   <!-- http://docs.wxwidgets.org/trunk/classwx_string.html#addd9ccfa3ae2b7ab2d66bcbf034d0be0 -->
   <!-- static wxString wxString::Format(const wxString & format, ...) -->
   <function name="wxString::Format">
+    <returnValue type="wxString"/>
     <const/>
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -33,6 +34,7 @@
   <!-- int wxString::Printf(const wxString & format, ...) -->
   <function name="wxString::Printf">
     <noreturn>false</noreturn>
+    <returnValue type="int"/>
     <leak-ignore/>
     <formatstr/>
     <arg nr="1">
@@ -268,6 +270,6 @@
   <podtype name="wxUint64" sign="u" size="8"/>
   <podtype name="wxIntPtr" sign="s"/>
   <podtype name="wxUIntPtr" sign="u"/>
-  <podtype name="wxDateTime_t" sign="u"/>
   <!-- typedef unsigned short wxDateTime_t; -->
+  <podtype name="wxDateTime_t" sign="u"/>
 </def>