diff --git a/cfg/wxwidgets.cfg b/cfg/wxwidgets.cfg
index 69b6aeb24..46359f96b 100644
--- a/cfg/wxwidgets.cfg
+++ b/cfg/wxwidgets.cfg
@@ -9283,6 +9283,39 @@
       <not-bool/>
     </arg>
   </function>
+  <!-- void wxMemoryBuffer::AppendByte(char data) -->
+  <function name="wxMemoryBuffer::AppendByte">
+    <leak-ignore/>
+    <noreturn>false</noreturn>
+    <returnValue type="void"/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+  </function>
+  <!-- void* wxMemoryBuffer::GetWriteBuf(size_t sizeNeeded) -->
+  <function name="wxMemoryBuffer::GetWriteBuf">
+    <leak-ignore/>
+    <noreturn>false</noreturn>
+    <returnValue type="void*"/>
+    <use-retval/>
+    <arg nr="1" direction="in">
+      <valid>1:</valid>
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+  </function>
+  <!-- void wxMemoryBuffer::UngetWriteBuf(size_t sizeNeeded) -->
+  <function name="wxMemoryBuffer::UngetWriteBuf">
+    <leak-ignore/>
+    <noreturn>false</noreturn>
+    <returnValue type="void"/>
+    <arg nr="1" direction="in">
+      <valid>1:</valid>
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+  </function>
   <!--bool Read(const wxString &key, wxString *str) const -->
   <!--bool Read(const wxString &key, double *d) const -->
   <!--bool Read(const wxString &key, float *f) const -->