diff --git a/configure.ac b/configure.ac
index 35abfbf..f2329a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -62,7 +62,7 @@ XORG_DRIVER_CHECK_EXT(XFreeXDGA, xf86dgaproto)
 # Checks for pkg-config packages
 PKG_CHECK_MODULES(XORG, [xorg-server >= 1.0.99.901] xproto fontsproto $REQUIRED_MODULES)
 
-CFLAGS="$CFLAGS $XORG_CFLAGS "' -I$(top_srcdir)/src'
+CFLAGS="$CFLAGS $XORG_CFLAGS "
 AC_SUBST([CFLAGS])
 
 # Checks for libraries.