diff --git a/src/mesa/main/glthread_draw.c b/src/mesa/main/glthread_draw.c
index 3ed75e470bd..8e6aeca002a 100644
--- a/src/mesa/main/glthread_draw.c
+++ b/src/mesa/main/glthread_draw.c
@@ -27,6 +27,8 @@
  * index data, so that glthread doesn't have to execute synchronously.
  */
 
+#include "c99_alloca.h"
+
 #include "main/glthread_marshal.h"
 #include "main/dispatch.h"
 #include "main/varray.h"