diff --git a/configure.ac b/configure.ac
index 5e83cbf..5cf44f1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -48,7 +48,7 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 PKG_PROG_PKG_CONFIG([0.20])
 
-AC_PATH_PROG([SPHINX_BUILD], [sphinx-build])
+AC_PATH_PROG([SPHINX_BUILD], [sphinx-build-3])
 AC_SUBST([SPHINX_BUILD])
 AM_CONDITIONAL([HAVE_SPHINX_BUILD], [ test "x$SPHINX_BUILD" != "x" ])