diff --git a/configure.ac b/configure.ac
index ff553d7a6..3e02308c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -729,7 +729,7 @@ BIGFONTPROTO="xf86bigfontproto >= 1.2.0"
 XCALIBRATEPROTO="xcalibrateproto"
 DGAPROTO="xf86dgaproto >= 2.0.99.1"
 GLPROTO="glproto >= 1.4.9"
-DMXPROTO="dmxproto"
+DMXPROTO="dmxproto >= 2.2.99.1"
 VIDMODEPROTO="xf86vidmodeproto >= 2.2.99.1"
 WINDOWSWMPROTO="windowswmproto"
 APPLEWMPROTO="applewmproto >= 1.4"