diff --git a/src/mesa/glapi/glX_API.xml b/src/mesa/glapi/glX_API.xml
index 3f2fbd1163c..0b1212f61b9 100644
--- a/src/mesa/glapi/glX_API.xml
+++ b/src/mesa/glapi/glX_API.xml
@@ -145,6 +145,13 @@
     </function>
 </category>
 
+<category name="GLX_SGI_swap_control" number="40" window_system="glX">
+    <function name="SwapIntervalSGI">
+        <return type="int"/>
+        <glx vendorpriv="65536"/>
+    </function>
+</category>
+
 <category name="GLX_SGI_make_current_read" number="42" window_system="glX">
     <function name="MakeCurrentReadSGI">
 <!--        <param name="dpy" type="Display *"/>