diff --git a/configure.ac b/configure.ac
index f4daf6d47..a88c64e7e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -733,7 +733,7 @@ XPROTO="xproto >= 7.0.31"
 RANDRPROTO="randrproto >= 1.6.0"
 RENDERPROTO="renderproto >= 0.11"
 XEXTPROTO="xextproto >= 7.2.99.901"
-INPUTPROTO="inputproto >= 2.3"
+INPUTPROTO="inputproto >= 2.3.99.1"
 KBPROTO="kbproto >= 1.0.3"
 FONTSPROTO="fontsproto >= 2.1.3"
 FIXESPROTO="fixesproto >= 6.0"