diff --git a/src/gallium/auxiliary/SConscript b/src/gallium/auxiliary/SConscript
index f365c4bbdd6..c989d13359c 100644
--- a/src/gallium/auxiliary/SConscript
+++ b/src/gallium/auxiliary/SConscript
@@ -7,6 +7,8 @@ env.Append(CPPPATH = [
     'util',
 ])
 
+env.Tool('udis86')
+
 env.CodeGenerate(
     target = 'indices/u_indices_gen.c', 
     script = 'indices/u_indices_gen.py',